noun
a biological characteristic that distinguishes male and female organisms
verb
to engage in sexual activity
adjective
related to sexual characteristics or activities
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The topic of sex education is an important one in schools.
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Do you think they're going to have sex tonight?
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I heard they hooked up last night, so they definitely had sex.
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The tension between the two countries is like a game of political sex, with each side trying to outmaneuver the other.