Which ever sex you are the other sex is "the opposite sex." So
if you are a boy, girls are the opposite sex.
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To chose not to have sex is to be celibate. To have no sexual
interest is being asexual. The opposite sex is whatever sex you are
NOT. If you are a male, females are the opposite sex, and vice
versa.
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The duration of The Opposite of Sex is 1.75 hours.
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The Opposite of Sex - musical - was created in 2004.
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Yes, there is a phobia of the opposite sex and it is referred to
as sexophobia.