I have a fantasy of hooking up with a girl. Not just kissing but being naked and going all the way. The problem is that my boyfriend, who I've been in a relationship with for years, thinks of it as cheating if I even so much as kissed another girl. I have a friend who is very curious as well, but her boyfriend says the same thing. I wouldn't want to ruin the friendship anyway, but I don't know what to do about these thoughts that keep plaguing my mind.