The difference between Heterosexual and Other-sex
When used as adjectives, heterosexual means sexually attracted to members of the opposite sex, whereas other-sex means of or pertaining to attraction to the opposite sex.
Heterosexual is also noun with the meaning: a heterosexual person, or other heterosexual organism.
check bellow for the other definitions of Heterosexual and Other-sex
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Heterosexual as an adjective:
Sexually attracted to members of the opposite sex.
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Heterosexual as a noun:
A heterosexual person, or other heterosexual organism.
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Other-sex as an adjective:
Of or pertaining to attraction to the opposite sex; heterosexual.