Yes, I would consider that to be rape. Regardless of what the legal definition might be in any particular place—it varies from jurisdiction to jurisdiction, after all—the person in question was made to have sex against his will and without his consent.* Morally speaking, that is rape.
As for the double standard: we live in a sexist society, and sexism harms both men and women. The same patriarchal standards that condemn women for having “too much” sex also condemn men for not having “enough” sex (or for turning down sex—unless, of course, the potential partner fails to meet some sort of arbitrary standard, in which case men are mocked for “stooping” that low).
So how would I react in the same situation? If it were now, I would wait until I could speak to the person in private and say something like, “I’m sorry to hear what happened to you with that girl. I know it might not seem like it, but what you described is rape. Even if you feel more embarrassed than traumatized, it was still a violation. It might even be worth talking to a professional about it just to work through your feelings.” I wouldn’t necessarily say all of this at once, but I would try to work each point into the conversation.
(And for the record, you can give a corpse an erection and make it ejaculate with the proper application of electrical stimuli. So it shouldn’t be so surprising that it can be done to a merely unconscious man.)
——————————
* The formulation “against his will and without his consent” was chosen on purpose. Either condition would be sufficient on its own. But this is a case where both apply, which makes it particularly clear that the person in question was raped. One might wonder how the two conditions could come apart. In answer to that, I offer the following two scenarios.
(1) Rape by deception: Alex is particularly concerned with avoiding sexually transmitted diseases and asks every potential partner about their testing history. Blake, who is trying to have sex with Alex, claims to have been tested and to have received a clean bill of health just the previous week. In fact, Blake was diagnosed with herpes 10 years ago. Alex has sex willingly, but Blake has not actually obtained Alex’s consent due to the deception.
(2) Rape by coercion: Casey works in a reputation-based industry. Devin has the power to ruin Casey’s reputation, thereby making Casey unemployable. So Devin offers Casey a choice: “Either have sex with me, or I will ruin your reputation. Don’t forget that you have spent 15 years getting to this point in your career and have no professional qualifications in any other field that pays well.” Upon reflection, Casey decides that being driven out of the industry is the more unpleasant option and agrees to have sex with Devin instead. Devin has obtained Casey’s consent, but Casey is not a willing participant.
We could, of course, stipulate a definition of “consent” on which being an unwilling participant entails a lack of consent, but it can be useful for various reasons to keep the two notions separate. For one, it helps us understand the variety of ways in which rape can occur, which may in turn help us combat the notion that certain things aren’t “really” rape.