tóng​xìng

homosexual

同性 tóng​xìng
homosexual adjective
pertaining to same-sex attraction, orientation, or relationships

Same-sex marriage is legal in some countries.

same nature noun
of the same nature, character, or biological sex

Like poles of a magnet repel each other, while opposite poles attract.

Frequency

Movie subtitles
4.08 per million appears in 1% of films
Written text
2.91 per million

Sources

Definitions
CC-CEDICT