sex
US /seks/
UK /seks/

1.
either of the two main categories (male and female) into which humans and most other living things are divided on the basis of their reproductive functions.
:
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What sex is your baby?
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The form asks for your name, age, and sex.
2.
sexual activity, including sexual intercourse.
:
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They discussed the importance of safe sex.
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The movie contained scenes of explicit sex.
1.
to determine the sex of (an animal).
:
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It's difficult to sex young chicks.
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The veterinarian will sex the puppies next week.