Now, I really do believe this question has implications on a number of levels. First of all, I've never actually heard of any man in my life who was sexually attracted, at least as a general rule, to women in comas.
It doesn't really make a lot of sense from a biological point of view. After all, being in a coma is a very unhealthy state indeed. Sure, you might recover, but, in general, probably not. And, death is usually a serious obstacle to effective procreation. So, it's really a total waste of effort to "seduce" a woman in a coma. Sure, it wouldn't be that all much effort, but, even so.
Now, I suppose, there could be a sense of power and control in "sexually dominating" a woman in a coma. But, not really that all much. After all, she's in a coma, she can't respond, really, at all. Much, much less sense of power and control than over a conscious woman being dominated physically in some way or another. There, you could be dealing with a high level of gratifying emotional response, if that is what you seek.
Really, a woman in a coma is scarcely better than a corpse. Indeed, in some ways, she's even worse. After all, she has to be kept alive somehow, in a coma, and, that tends to be a very great deal of trouble, indeed. Who needs it? Why not go straight to necrophilia, why waste time and effort with the comatose?
So, what this brings to mind, is why precisely, crime writer Patricia Cornwell has written at least one book that I read years ago, on this particular theme. A male movie star had worked, prior to his success in films, in ICU units as a nurse/technician. And, apparently, he'd had some "meaningful relationships" with some of his female patients there. Somehow, I really doubt the practical opportunity would arise for this, but, whatever. And, by the time he became a movie star, he really wasn't interested in women anymore except under these rather particular circumstances. So, he used his money and power to arrange "dates" with suitable women, to satisfy his unusual emotional needs. Of course, they did not survive these "dates".
Now, of course, as a writer, Cornwell must try to attract attention with the novel and unusual, perhaps even with the impossible. But, actually, there is, I believe, more of a tendency for female nurses to actually murder extremely vulnerable patients than male nurses or doctors. It's the female nurses who murder neonates, not the men. The combination of nurturing, abuse and murder fits in better with female maternal instincts run askew, than with male predation, which favors simplicity.
So, I wonder if Patricia Cornwell isn't, just possibly, projecting some of her own inclinations, in this particular case. So, if you're a pretty young woman, Patricia may be visualizing you in a comatose condition. If she offers you a drink, please, decline it.