Definition of opposite sex
: the other one of two sexes or genders Crayfish recognize members of their species and opposite sex partly through pheromones, the signal-sending chemicals also used by many insects.— David M. Lodge, et al. —usually used with the; used especially to refer to women from the point of view of men or to men from the point of view of women He gets nervous around people/members of the opposite sex. [=around women]Manifestations of gender identity disorder range from simply living as a member of the opposite sex to partial or maximal physical adaptation through hormonal and surgical treatment.— Louis J. Gooren… every father feels a pang when his daughter begins to take a "healthy" interest in the opposite sex.— Martin Amis
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