My H and I did a little mock rape thing last night and his intensity really surprised me. I actually felt a tiny tiny twinge of 'oh this feels scary, not good' because he is really a strong guy..and was doing me so hard that I could scarcely breathe. Which surprised me, cause I like very hard sex. But I guess I had no idea of how hard he can really do it when he wants to. He has always said "You don't want me to unleash on you" when I would ask him to be more aggressive during sex. I think the ferocity of his sex drive scares him, rather than titillates him.
I consider myself able to take a LOT during sex, but this was a little unnerving. Either that or I wasn't turned on enough to really be into it.