Top definition
One who doesn't identify as Bi-sexual, Lesbian, Heterosexual, Homosexual, etc .. Their sexuality changes with the time, location, and whether or not they are aroused and who is around them.
*Boy and girl are making out, then another girl comes walking past, then the girl starts making out with the other girl*

Girl #2: Whoa, are you bi?!
Girl #1: I'll be anything you want me to be, baby ;) You see, I'm an adaptsexual! :D
Boy: =( </3
by Katherpillar October 02, 2008
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