(I've always been curious how it feels (if possble at all)when a man gets raped (by a woman)...)
Of course it is possible for a woman to screw a man without his consent. But as he would have to have an errection, it would be even more difficult to prosecute a woman for rape than a man. It could be argued that his errection was proof of consent, and even if he could prove that he did not consent, she could argue that she thought he was consenting because he had a hard-on.
Have you ever passed out and woken up to find a some strange slapper playing with your penis[edit] (in case you have not noticed men get a boner while sleeping). It can be an unplesant and disturbing experience, even if she is attractive.
Rape can be a difficult charge to prove, with victims often too ashamed to come forward until long after the incident (if at all). The rapist often anticipates the victims response, and discredits them before they get a chance to confide in anybody. Also, Police, in my experience, treat victims of crime even worse than they treat the criminals if the victim is poor, young, ethnic or funny looking.
My society tends to tell men that they are all supposed to be studs, and men who speak out about being sexually assalted by women are rarely taken seriously. A 15yo girl dating an older man is frowned upon by all, but a 15yo boy dating an older woman is considered lucky. It is still a crime, but it is far less likley to go to court, and far less likley to convict a female-paedophile or rapist than a male.