Being an adopted child of no blood relation to one's adopted parents, the act of having sex with
a relative. It has all the flavor of incest
without the incest
, technically since there is no close
biological link between
the two (or more) individuals partaking in the act.
Mike: Hey, Nick, did you hear Brian fucked his older
Nick: Awww, gross, dude!? What the fuck?
Mike: I know, but technically they're not related. Brian is adopted; so, it was diet incest.