What do you think public perception would be of two teenage girls who played with the genitals of an unconscious drunk guy?

In the local community, if the two girls were co-captains of the softball team, and the town was softball-mad in the way Steubenville is apparently football-mad (American football)?

I expect the locals in that hypothetical would react essentially like the locals in Steubenville - laughing at the victim, sharing humiliating pictures on social media, pressuring the victim not to complain. If the local reaction made national news, I expect criminal charges would be brought. Would the judge in the case warn the defendants "to have discussions about how you talk to your friends; how you record things on the social media so prevalent today; and how you conduct yourself when drinking is put upon you by your friends"? Don't know.

Your claim is that society is more tolerant of non-consensual violence on males, so your claims are false if society is merely equally tolerant. (And society is too tolerant of all physically harmful pressure to non-consensually or semi-consensually risk physical harm - consider the enormous social pressure on athletes to "man up" and play through injury).

Regarding Slate magazine (the source I've been linking) - I was linking them only for the facts - I don't expect you to agree with their analysis, and I don't necessarily endorse the analysis in any particular. But the facts they report are facts.