Dr. Helen asks an interesting question here. However the example is very bad. They guy got drunk, went home with a woman and she took advantage of him while he was passed out. When he found himself the object of unwanted attention he did not insist on his rights but let it happen because of fear of the law. This strikes me as implausible. If he had simply walked out the odds of anything bad occuring to him are slim to none.
This kind of case would cause even more problems however. The feminists have taught us that every sexual act must be explicitly consensual (and even those may be rape). What if he voluntarily slept with her, decided against it and then went to sleep and the same thing happened? Would he still have a rape case? I think it would be seen as implied consent, however, under this scenario every time some girl starts the festivities before the guy is fully awake it could be a rape accusation.
Interestingly, in some jurisdictions the definition of rape (rather than assault) requires that the victim experience "penetration however slight." This does not occur to men in this example.
He was not tied up. He was not physically incapacitated throughout. He was not overpowered or threatened at gunpoint with bodily harm. I think the elements of proof in this story make it almost impossible to get a conviction beyond a reasonable doubt. I would also look into a "diminished capacity" defense for the pregnant woman caused by the alcohol and the sexual hormone spike many women have at certain points in pregnancy that create vastly increased sexual desire.
Bottom line: I do not believe that 19 year old male marines getting raped by women is a widespread societal problem.