The word rape has various meanings today. Some, like the one which will be about its sane legal definition, are sadly mostly historical in current Western culture, though they still subsist in some saner cultures even today. So what are these definitions?
Sane definition of the act of rape - This definition is also consistent with Common Law ("Carnal knowledge of a woman forcibly and against her will") and even with evolutionary psychology (“Human copulation resisted by the victim to the best of her ability unless such resistance would probably result in death or serious injury to her or others she commonly protects” is the definition used by Thornhill & Palmer in A Natural History of Rape).
So rape can only be performed by a penis and of course women can't rape men.
Sane legal definition of rape - Sane legal systems differentiate between act of rape and a crime of rape. A sane legal definition of rape doesn't believe all acts of rape are crimes of rape.
What nonsense would it be to believe that and to treat the whims of some sluts as actually defacing a virgin or a married woman !
A sane legal definition of rape would define rape as a property crime against the woman's father or husband. Also, rapes against prostitutes should be prosecuted. But it would certainly never account for rapes of sluts, and would consider raping a slut a justified response that should be praised, not persecuted.
Current insane definition of the act/crime of rape - I am saying act/crime of rape because insane modern Western cultures basically don't differentiate between the act of rape and a crime of rape.
In any case, this definition had been, especially since 2000, expanded to include much more than just the actual act of rape. It now includes any form of coercion, inserting objects into sexual orifices, even the insane claim that a woman can rape a male ! There are feminists/liberals insane enough to believe Brock Turner raped some unconscious woman he fingered or that I raped a woman who offered my sex herself in a phone call, simply because I put her picture on my blog when she decided to torture me (as she later admitted herself).
An actual moral definition of rape used by feminists/liberals - this is what almost all feminists and liberals actually see as rape. It is defined as any act a straight white male does to get sex. Asking a woman out by a straight white male is rape to liberals. Going on a date if you're a straight white male is rape. On the other hand, no actual act of rape, even rape of smallest children, is rape if it is done by Sacred Classes like blacks, Muslims or Hispanics.
I will admit that there are some feminists and liberals who don't believe so, but these mostly stop calling themselves feminists or liberals once they realize what these ideologies are about.
It is also true that this definition isn't yet widely used in law but and police officers and judges who don't use this definition are seen as vermin by liberals and there are places in the West where it's slowly getting there .
Female definition of rape- Women simply define rape as sex they regret, and pay basically no intention to any other circumstances, including physical pain. So this definition is completely silly and shouldn't be regarded by anybody sane as anything more than what 5 year-old children think. That some legal systems are starting to bring this definition into equation (though usually by ignoring the sex with a member of Sacred classes females regret) is simply a symptom of a decaying society.