Slave of the Galaxies - Robin Scott

I should say this is a sci-fi romance but I don't know what kind of twisted "romance" this could be. She falls in love with a man who makes her experience pain so intense that she poops and pees on herself (for her own good). Then has to have sex with aliens who tear her up inside. She of course is screaming in pain and with her orgasms while she's bleeding all over his dick and herself.

I liked the cover.