Bestiality describes sexual activity between a person and a non‑human animal. In legal practice it denotes the criminal offence of engaging in intercourse or other sexual acts with an animal.Across the UK and Ireland this conduct is prohibited by statute: in England and Wales under the Sexual Offences Act 2003 (using the term “intercourse with an animal”); in Scotland under the Sexual Offences (Scotland) Act 2009; in Northern Ireland under the Sexual Offences (Northern Ireland) Order 2008; and in Ireland under the Criminal Law (Sexual Offences) Act 2017 (using “sexual act with an animal”). “Bestiality” is therefore a descriptive label rather than the modern statutory wording, but it remains widely used in legal commentary, charging language and case reporting.Key features include intentional performance of the sexual act; an animal’s “consent” is legally irrelevant. Associated offending often arises, including animal welfare offences (e.g., causing unnecessary suffering) and offences concerning extreme pornographic images depicting sexual activity with animals.Practical significance includes prosecution and sentencing under the relevant sexual offences legislation, consideration of ancillary orders (such as Sexual Harm Prevention Orders) and, in appropriate cases, disqualification from owning or keeping animals. The core prohibition is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland, though terminology and maximum penalties vary.