"Sex" refers to the biological characteristics that classify organisms into male or female, typically based on reproductive organs and genetic information. Full definition
Higher testosterone levels were linked to lower sensitivity, while higher feminine traits (regardless of sex of tested participants) were linked to higher sensitivity. (sciencedaily.com)
Someone female only make date for sex with new people. (datingsimilar.com)
This is a bit difficult for casual sex with locals and online dating. (sexsearchcom.com)