Consensual sex between same-sex couples is unlawful [L1.1], [R1.1].
The Sexual Offences Act 1992, Chapter 154 provides -
Buggery - Section 9
"Any person who commits buggery is guilty of an offence and is liable on conviction on indictment to imprisonment for life.
Serious indecency - Section 12
"(1) A person who commits an act of serious indecency on or towards another or incites another to commit that act with the person or with another person is guilty of an offence and, if committed on or towards a person 16 years of age or more or if the person incited is of 16 years of age or more, is liable on conviction to imprisonment for a term of 10 years.
(2) A person who commits an act of serious indecency with or towards a child under the age of 16 or incites the child under that age to such an act with him or another, is guilty of an offence and is liable on conviction to imprisonment for a term of 15 years.
(3) An act of "serious indecency" is an act, whether natural or unnatural by a person involving the use of the genital organs for the purpose of arousing or gratifying sexual desire." [R1.1].