性 - sex, gender, nature

sexually transmitted disease; STD; sexually transmitted infection; STI; venereal disease; VD

necessity; need

acute (illness)

credibility; authenticity; confidence; reliability

nature; natural constitution; innate disposition

same sex

erogenous zone

nature; disposition

individual; distinctive; unique; characteristic; personal; idiosyncratic

individuality; personality; quirk; idiosyncrasy; character; individual characteristic

(distinction of) sex; gender

true character; real nature