The word(s) "sex" appears 64 time(s) in 55 verse(s) in Quran in Mohsin Khan translation.

(51) O Prophet (صلى الله عليه وسلم)! When you divorce women, divorce them at their 'Iddah (prescribed periods) and count (accurately) their 'Iddah (periods ). And fear Allah your Lord (O Muslims). And turn them not out of their (husband's) homes nor shall they (themselves) leave, except in case they are guilty of some open illegal sexual intercourse. And those are the set limits of Allah. And whosoever transgresses the set limits of Allah, then indeed he has wronged himself. You (the one who divorces his wife) know not it may be that Allah will afterward bring some new thing to pass (i.e. to return her back to you if that was the first or second divorce).

(52) And those who guard their chastity (i.e. private parts from illegal sexual acts).

(53) Was he not a Nutfah (mixed male and female sexual discharge) of semen emitted (poured forth)?

(54) And made of him two sexes, male and female.

(55) Verily, We have created man from Nutfah (drops) of mixed semen (sexual discharge of man and woman), in order to try him: so We made him hearer and seer.