Fauken:
It is if the rapist is also a man in this case. The issue isn’t a man being raped, but the fact they’re the same sex. The fact it is a homosexual act makes it more grave than if it were between members of the opposite sex, regardless whether both of them are men or women. A man raping a man is equally as bad as a woman raping a woman, and a man raping a woman is equally as bad as a woman raping a man.
You seem to be working from the premise that it is possible for a woman to commit rape. Since rape requires that the rapist must have a penis, it is a crime that can only be committed by a man, unless you accept the idea that a person with a penis can be a woman, as many do these days, of course. It is therefore unhelpful to introduce the scenarios in which a woman rapes a man or in which a woman rapes a woman.
That being the case, the comparison is between the scenarios in which a man rapes a woman and in which a man rapes a man. I honestly cannot understand how anybody can claim that one is worse than the other. Can you not see that the vast majority of people would actually find this comparison to be not only pointless but actually deeply offensive and insensitive? I for one could not bring myself to say to a female rape victim that her rape was less serious than if a man were raped.
I think that you also make a fundamental mistake in assuming that male-on-male rape is a homosexual act. The vast majority of people now understand that rape has very little to do with sex
per se. It is more a crime of power and violence. This includes, for example, rape as a weapon of war, which has both male and female victims. It is very unlikely that many of the perpetrators of such male-on-male rapes would consider themselves to be gay or bisexual.
It is a difficult category to grasp. But yes, acts that utterly discard the principle of human generation are generically graver offenses against the virtue of chastity, as they go directly against the One Who made the sexual faculty and its order in the first place, as opposed to merely misusing it with violence. That does not necessarily mean that each act in each category is worse/better than the other, but it is a matter of the category itself…
It is indeed a difficult category to grasp. It seems to suggest that a crime against “the principle of human generation” (an abstract philosophical concept) is in some way more serious than a crime against the right of a woman not to be raped. It sounds as if you are saying that homosexuality is a crime against God, whereas rape is “merely” a crime against women. The very phrase “merely misusing it with violence” seems to suggest that the rape of a woman is deemed a comparatively trivial crime.