Yes, it is.
The situation above is vanishingly rare. Unless a woman is an out and out nutter, she doesn't have a sense of entitlement which many otherwise "normal" men have. If a man kisses a woman and fondles her nipples, she doesn't generally feel that she has a god-given right to jump on his dick irrespective of whether he's up for that or not. Also, even if she does have such an unusual (in a woman) sense of entitlement, most women can't actually physically accomplish such a thing, because a man who doesn't want that, can generally stop her very easily because he's bigger and stronger than her.
That strength and size of course, makes no difference if the psychological situation affects the man's ability to make use of his strength and size; but in most cases, men don't feel psychologically the same as most women would in that situation - many women do feel that once things have got to a certain point, they have "signed up" for penetration and they have no right to get out of it now, even though they may not want to have penetrative sex. And men in that situation, don't feel that if they come right out and say that they don't fancy it anymore, they may end up being attacked and far worse may happen to them, if they don't go through a bit of reluctant penetrative sex.
I think the most reliable gauge of whether men are more likely to be raped by women or by other men, is to ask the helplines which counsel male victims of rape, what percentage of calls are from men needing support because they've been sexually assaulted in this way by women, and what percentage are from men who need support because they have been raped by other men. I know where I'd place my bet.