I can't speak for all of us, but as a non-op transwoman, here is my position on this: while I enjoy being fondled & orally pleased, taking the "masculine" role in intercourse doesn't appeal to me because I don't identify myself in a masculine way at all. My guess is that most tg/ts probably feel similarly, but there are always exceptions to the rule. In my experience, most of the men I've been with wanted me to top them. I see personal ads on various websites from men who say they are looking for a tg/ts to top them, but I would wager that many of these men just don't know quite how tg/ts differ from a cd in the sexual arena. Where a cd may just as well be any heteroflexible cisgender man who just wears women's clothes for kink, transwomen live & identify as women and dressing as such is just a normal daily part of life. My short answer (I know, too late for that!) is that I would say that most of us have little to no interest in topping.