I agree with others here that there should be no forcing or making someone uncomfortable doing something. Sex isnt 'tit for tat' and I hate when women (usually anti-anal) say 'Let me do it to you first!' Sex shouldn't resemble childish games.
The best lovers are those with open minds who strive to please their partner. Any new activity can be discussed to see what works for both people. The above 'only if I get to do it to you too!' is more done out of spite or revenge or something, not out of a genuine desire to penetrate her man. If a woman does get turned on by the thought of pegging she should approach her partner and see how he feels and then go from there, taking small steps if need be. Which is exactly how men should approach women about engaging in anal sex.
If both partners main goal is to please the other, then the sky is the limit for sexual exploration and pleasure.