Definition from macmillandictionary.com
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Please don’t talk about sex in front of the children.
the impact of sex and violence in TV programmes
Parents worry about their teenagers having sex.
a sex partner (=someone who you have sex with)
a sex scandal involving the President
equal treatment of the sexes
The hostel has separate sleeping areas for each sex.
Discrimination against someone based on their sex is illegal.
We don’t want to know the sex of our baby before it is born.