Dear all, When I say "sexual partner" I specifically means "people who is not your lover or spouse, but you often have sex with each other for fun". I think each language may have its slang for this kind of people. Could be funny. In Chinese (PRC), it's called 炮友. (pao4 you3) "cannon friend". 炮: "cannon" is a metaphor of "intercourse". Similarly, 约炮 "date for cannon" is the verb which actually means "date for sex".