Longman Dictionary of Contemporary English homepage

Topic: BIOLOGY

Date: 1300-1400
Language: Latin
Origin: sexus

sex

1 noun
     
sex1 S1 W2
1 [uncountable] the physical activity that two people do together in order to produce babies, or for pleasure:
All you see on TV is sex and violence these days.
They had sex in the back seat of his car.
She no longer wanted to have sex with him.
premarital sex/sex before marriage (=sex happening before marriage)
the dangers of casual sex (=having sex with someone without intending to have a serious relationship)
safe sex (=ways of having sex that reduce the spread of sexual diseases)
unprotected sex (=sex without a condom)
2 [uncountable]HB whether a person, plant, or animal is male or female:
Put your name, and sex at the top of the form.
3 [countable] all men, considered as a group, or all women, considered as a group:
He found it difficult to talk to members of the opposite sex (=people that were not his own sex).
People of both sexes (=both men and women) buy her records.
4

single-sex school/college etc

British English a school etc for either males or females, but not for both together
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