Come on now...that seems a just a tad bit condescending and judgmental to me...The accounts I read simply said she needed a ride home and he offered it to her. They "ended" up in the bedroom (not clear who took off her britches, one report said she did...another report said he did), he asked her if Aunt Flow was in town and she affirmed that...so he left.
I fail to see where the DO NOT DO THIS message comes into play...sounds like most Friday or Saturday nights in a ton of college towns...