i never can answer this question straight.
honestly nothing i ever did was too kinky, because i enjoyed it and most of the times did it again.
i think kinky is what i haven't done yet.
but i intend to eventually do everything that crosses my perverted dirty lil' mind
(as long as it's not life threatening or mutilating and is ok with my partner)
and what is kinky?! are we comparing it to missionary position with dim lights and kids sleeping in the next room?