Collocations for sex - noun

female, male | opposite
At that age they can started becoming shy with the opposite sex.

single
a single-sex school

fair/fairer, gentle
(humorous) (= women; some women may find these terms annoying)

change
She''s had a sex change operation.

equality | discrimination, inequality | ratio

between the ~es
differences/inequalities/relations between the sexes

the battle of the sexes
The quiz is a battle of the sexes between a team of male students and a team of female students.

on grounds of sex
discrimination on grounds of sex

irrespective/regardless of sex
The word ‘man’ can refer to all humans, irrespective of sex.

anal, oral, penetrative, vaginal | gay, homosexual, lesbian | heterosexual | good, great, passionate | safe | unprotected, unsafe | consensual, non-consensual | extra-marital, illicit, premarital | kinky | casual, promiscuous | unlawful
He was convicted of having unlawful sex with an underage girl.

explicit, gratuitous
Films containing explicit sex are banned.

engage in, have
She had never had sex before.

consent to | refuse | obtain, procure

life
a healthy sex life

drive, urge
a low sex drive

appeal
Despite his age, he still has a lot of sex appeal.

act, practices
photos showing sex acts safer sex practices

therapist, therapy | organ | hormone | education | abuse, assault, attack, crime, offence
child sex abuse

maniac
He had a reputation of being a sex maniac.

fiend
(informal),

offender, pest
(informal)

film, scene, show | symbol
She wants to be known as a singer rather than as a sex symbol.

shop | aid, toy | scandal

~ between
sex between consenting adults

~ with
sex with her husband