I've always had a very imaginative fetish for bellybuttons, both giving and receiving. While it can stretch into pretend roughness and some dark roleplaying please do not think that is real at all. Its just dark and imaginative. The pretend knife play side of it can be very erotic to play out in both directions. The important part is that it is ONLY heterosexual. I have zero interest in any activity involving another man with the same interest - not even in a discussion. I am very interested in finding a woman who not only understands this fantasy but also would have a lot of fun playing it out!