provocation:... 2. something that incites, instigates, angers or irriates [ME, from Latin: a calling forth].

And of course, right below that is provocative: tending or serving to provoke; inciting, stimulating, irritating or vexing...

Someone said that the dictionary was the best place to go looking for porny inspiration and I think she was right. That said, I reserve the right to do a G-rated drabble *EG*