same-sex

adjective
  1. of or relating to two or more persons of the same gender: same-sex friendships.
  2. of or involving a sexual relationship between two men or between two women: same-sex marriage.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for same-sex
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper