I was thinking about this thread more today and I have a second take on it. I've mentioned before that my husband and I practice BDSM...I honestly cannot imagine being in a relationship with someone where that was not a part of it. I enjoy the physical suffering it brings. Honestly I can be bruised and bleeding after a session and that is often the happiest I ever am. Part of it is the intimacy involved in the whole process, but another part is seeing how much I can endure because I relish in that feeling.