i would draw the line at anything that really hurts, gross stuff... i might try something but if i really didn't like it i wouldn't keep doing it. i'm curious and adventurous but a lot of what you see in porn is just not appealing on any level. gaping assholes? ewww fisting? uh no way. trampling? weird but maybe. smothering? also weird but maybe... i really don't get the whole female dom/male slave sex fetish but it might be fun to play around with some if i wasn't having fun though sex would become a chore.