I am into femdom, but not interested at all in having stuff up my ass. Not sure how common it is for submissive guys to be into that though. Always thought it's more of a homosexual thing. Also from my experience (and I am quite experienced in that matter
) very few real life Dommes are into pegging, since it doesn't really give them any direct pleasure.
The way I see it, pegging a guy is more of a service to the guy (who is into that) and therefore done mainly by professional dominatrices.
In Christine's case it's possible though, she has such equipment for her female lovers. Would personally find it a bit strange though, if she would want to use that on a guy. I would ask her then, if she needs to feel more like a man to be truly dominant.