Why UK sexual offences law turns on consent and age, not marriage

What is the age of consent in each UK nation?

The age of consent is 16 in England and Wales, Scotland and Northern Ireland, although each nation reaches that age through its own legislation. The United Kingdom has no single criminal code, so three separate statutes do the work: the Sexual Offences Act 2003 in England and Wales, the Sexual Offences (Scotland) Act 2009 in Scotland and the Sexual Offences (Northern Ireland) Order 2008 in Northern Ireland ^[1][2][3].

In England and Wales, section 9 of the 2003 Act applies to a person aged 18 or over who intentionally touches another person in a sexual way. The offence is committed if the other person is under 16 and the defendant does not reasonably believe that the person is 16 or over, or if the other person is under 13, in which case no belief about age is a defence on the face of the section ^[1]. Where the touching involves penetration of the anus, vagina or mouth, the maximum sentence on conviction on indictment is 14 years ^[1].

Scotland uses different wording. Section 28 of the 2009 Act creates the offence of "having intercourse with an older child": a person aged 16 or over whose penis penetrates, to any extent, the vagina, anus or mouth of a child aged at least 13 but under 16, intending or being reckless as to penetration ^[2]. The page opened for this article does not show the penalty or any defences, which are found elsewhere in the Act.

Northern Ireland's Article 16 closely follows the English section. It covers a person aged 18 or over who touches a child under 16 sexually without reasonably believing the child to be 16 or over, or who touches a child under 13, and the maximum on indictment is 14 years for penetrative conduct and for other cases ^[3]. Northern Ireland changed its age: the 2008 Order reduced the age of consent there from 17 to 16, with effect from 2 February 2009 ^[6][10].

Because the offence differs from nation to nation, the age of consent should be read as a general rule rather than a single section. The numbers are the same, but the offenders, defences and sentences are not. This article describes the criminal law only and is not legal advice.

Age of consent and key child sex offence provisions in the UK (checked October 2026)

Nation	Age of consent	Main provision	What the text covers	Notes
England and Wales	16	Sexual Offences Act 2003, s.9	Sexual touching of a child under 16 by a person aged 18 or over, unless the person reasonably believed the child was 16 or over; no belief defence if under 13	Up to 14 years on indictment; ss.5-8 deal separately with children under 13
Scotland	16	Sexual Offences (Scotland) Act 2009, s.28	Penile penetration of a child aged 13 to under 16 by a person aged 16 or over	Penalty and defences not on the page opened
Northern Ireland	16 (17 until 2 February 2009)	Sexual Offences (Northern Ireland) Order 2008, art. 16	Sexual touching of a child under 16 by a person aged 18 or over, unless reasonable belief of 16 or over; no belief defence if under 13	Up to 14 years on indictment
England and Wales (marriage)	Minimum age to marry: 18	Marriage and Civil Partnership (Minimum Age) Act 2022	In force 27 February 2023	Scotland: 16 (1977 Act, 2021 text); Northern Ireland: 16 with consent, bill for 18 introduced March 2026

How did the Criminal Law Amendment Act 1885 raise it?

The Criminal Law Amendment Act 1885 raised the age of consent from 13 to 16, and it did so after a press campaign that shocked Victorian readers ^[9]. The Act is dated 14 August 1885 ^[9]. It also set penalties for sexual offences against women and minors, made it an offence to procure girls for prostitution by drugs, intimidation or fraud, and strengthened the law on brothels ^[5].

The campaign was led by W. T. Stead, editor of the Pall Mall Gazette. His investigation appeared over a week from 6 July 1885 under the title "The Maiden Tribute of Modern Babylon" ^[9]. To expose child prostitution he bought a 13-year-old girl, Eliza Armstrong, from her parents ^[5]. The revelations caused an uproar and helped to bring Parliament back to a bill whose progress had stalled ^[5][9].

The same Act contained a second, quite different provision. Section 11, added by the Liberal MP Henry Labouchere in August 1885, made "gross indecency" between men a crime punishable by up to two years' imprisonment ^[5][9]. The term was left undefined, and in practice it covered male homosexual acts short of sodomy. The history of how English law dealt with sex between men, and the later arguments about its limits, is traced in the article on the Wolfenden Report and the Hart-Devlin debate.

The Act extended across the United Kingdom, and it was later repealed for England and Wales by the Sexual Offences Act 1956, whose provisions were in turn replaced by the 2003 Act ^[5].

The provisions described above concern prostitution, procuring, brothels and the protection of children, and the summary of the Act used for this article makes no reference to marriage ^[5]. The age of 16 was set as a line in the criminal law, and it has stayed the central number ever since.

What does the Sexual Offences Act 2003 say?

The Sexual Offences Act 2003 organises the law around consent and age, with separate offences for adults who have sexual contact with children and special rules for the youngest. Part 1 sets out rape in section 1 and then a block of offences against children under 13, with rape of a child under 13 in section 5, assault by penetration in section 6, sexual assault in section 7 and causing or inciting sexual activity in section 8 ^[4]. Those four sections protect the youngest children and do not depend on any question of belief about age ^[4].

Sections 9 to 15 cover child sex offences more generally. They include sexual activity with a child (section 9), causing or inciting a child to engage in sexual activity (section 10), sexual activity in the presence of a child (section 11), causing a child to watch a sexual act (section 12), offences committed by children or young persons (section 13), arranging or facilitating a child sex offence (section 14) and meeting a child following sexual grooming (section 15) ^[4].

The Act also gives its own definition of consent. Section 74 defines "consent," and sections 75 and 76 set out evidential and conclusive presumptions about it ^[4]. For adults the key question is whether the other person agreed and had the capacity to do so, while for children the law replaces the question of agreement with a rule about age. A child under 16 cannot lawfully consent to sexual activity with an adult of 18 or over, whatever the child says.

Section 13 deserves a separate mention, because it addresses a common question. The Act contains a distinct heading for child sex offences committed by children or young persons ^[4]. This suggests that the legislators did not treat every sexual act between teenagers in the same way as an act by an adult. The detailed wording of that section and the guidance on prosecution were not checked for this article.

The 2003 Act is the main modern statute for England and Wales. Its approach is that the law looks at the age of the people involved and at consent, and the next section explains why it does not ask whether they are married.

Why does marriage no longer matter in sexual offences law?

Marriage no longer matters because the criminal law of sex now asks whether the other person consented and whether a child is protected, not whether the people involved are married. The child-protection offences in the 2003 Act, the 2009 Scottish Act and the 2008 Northern Ireland Order are written in terms of age and belief about age, not marital status ^[1][2][3]. None of the provisions examined for this article makes sex between consenting unmarried adults an offence. Marriage survives only in narrow exceptions: under section 23 of the 2003 Act, conduct that would otherwise be an abuse of a position of trust is not an offence if the young person is 16 or over and the two are lawfully married or civil partners, and sections 28 and 43 contain similar exceptions for the family offences and for the offences by care workers against people with a mental disorder ^[11][4].

This was not always so. Older law was built around marriage and the church. Fornication was once a matter for the church courts, which are described in the article on church courts and bawdy courts in England, and the question of whether the criminal law should enforce private morality was the subject of the Wolfenden debate. Today the position of sex outside marriage is explained in the article on whether fornication is illegal in the UK.

Marriage still matters in a different way: as an age limit. Under the Marriage and Civil Partnership (Minimum Age) Act 2022, the minimum age for marriage and civil partnership in England and Wales is 18, and the Act's regulations brought it into force on 27 February 2023 ^[7]. Marriage documents issued before that date for a party who would still be under 18 for the whole of their validity became void, while those where both parties would reach 18 during the validity period stayed valid but could not be used until both were 18 ^[7]. The regulations apply to England and Wales only. In Scotland, section 1 of the Marriage (Scotland) Act 1977 sets the minimum age at 16, according to the 2021 version of the text, and later changes were not checked ^[12]. In Northern Ireland the minimum is 16 with parental consent, and a Marriage and Civil Partnership Bill introduced in the Assembly on 20 March 2026 proposes 18; its final outcome was not confirmed ^[13].

The effect is to separate two ideas that once travelled together. The age of consent to sexual activity is 16, but the age at which a person can marry in England and Wales is now 18. A 16-year-old in England or Wales can consent to sex but cannot marry, which shows how far the law has moved from treating marriage as the gateway to lawful sex.

What protections exist for 16 and 17-year-olds?

Young people aged 16 and 17 can lawfully consent to sex, but the law still protects them from abuse of trust and exploitation. The best-known protection is the position of trust offence in sections 16 to 19 of the 2003 Act, which covers sexual activity with a child, causing or inciting a child to engage in sexual activity, sexual activity in the presence of a child and causing a child to watch a sexual act, when the offender is in a position of trust towards the young person ^[4].

Positions of trust were widened in 2022. Section 47 of the Police, Crime, Sentencing and Courts Act 2022 inserted a new section 22A into the 2003 Act, under which a person is in a position of trust towards another if they regularly coach, teach, train, supervise or instruct that person in a sport or religion, and know that they do so ^[8]. The definition of sport includes games where physical skill is the main factor and physical recreation done for competition or display, and religion includes religions that believe in many gods and those that believe in none ^[8]. The section came into force on 28 June 2022, and the Secretary of State can add or remove activities by regulations ^[8].

Other protections apply by their nature to all children and young people. The grooming offence in section 15 of the 2003 Act, for example, concerns meeting a child following sexual grooming ^[4]. The statute also contains the offences of causing or inciting sexual activity with a child and of engaging in sexual activity in a child's presence, so the law reaches conduct that falls short of physical contact ^[4].

Scotland and Northern Ireland have their own position-of-trust provisions, and this article has not compared them with the English ones. The point for a reader is that being above the age of consent does not mean that every sexual relationship is lawful. A person who regularly coaches, teaches or instructs a 16 or 17-year-old in a sport or religion can commit an offence in England and Wales even where the young person agrees, and the Act's other position-of-trust categories work in the same way.

Frequently asked questions

Has the age of consent always been 16?

No. The Criminal Law Amendment Act 1885 raised it from 13 to 16, after the campaign led by W. T. Stead. In Northern Ireland the age was 17 until the Sexual Offences (Northern Ireland) Order 2008 reduced it to 16, with effect from 2 February 2009.

Is the age of consent the same in Scotland and Northern Ireland?

Yes, it is 16 in both, as in England and Wales. The wording of the offences differs: Scotland's Sexual Offences (Scotland) Act 2009 has a separate offence for sex with a child aged 13 to 15, while Northern Ireland's Article 16 closely follows section 9 of the English 2003 Act.

Can 16-year-olds still marry in England?

No. Since 27 February 2023 the minimum age for marriage and civil partnership in England and Wales is 18, under the Marriage and Civil Partnership (Minimum Age) Act 2022. The age of consent to sexual activity remains 16. Scotland's 1977 Act sets 16, and Northern Ireland allows 16 with parental consent, although a bill proposing 18 was introduced there in March 2026.

What is a position of trust offence?

It is an offence for a person in a position of trust to have sexual activity with a young person under 18 in their care, even above the age of consent. It is set out in sections 16 to 19 of the Sexual Offences Act 2003. Since 28 June 2022 it also covers people who regularly coach, teach, train, supervise or instruct a young person in a sport or religion.

Is it a crime for two 15-year-olds to have sex?

Section 9 of the Sexual Offences Act 2003 applies only to a person aged 18 or over, but a separate section 13 covers child sex offences committed by children or young persons. How that section works in practice, and how prosecutors apply it, was not checked for this article, so anyone with a real concern should seek specialist advice.

Is sex outside marriage a crime between adults in the UK?

No. The sexual offences statutes of all three UK systems turn on consent and age, not on marital status, so sex between consenting unmarried adults is not an offence. Marriage appears only in narrow exceptions, such as section 23 of the 2003 Act. The older idea of fornication as an offence is described in the article on whether fornication is illegal in the UK.