of or relating to two or more persons of the same gender: same-sex friendships.
of or involving a sexual relationship between two men or between two women: same-sex marriage. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for same-sex

Contemporary Examples of same-sex

Word Origin and History for same-sex

with reference to homosexuality, 1981, from same + sex (n.).

Online Etymology Dictionary, © 2010 Douglas Harper