Same thing in Canada too...a lot of high school and early university girls nowadays prefer to do anal before they lose their virginity to someone, especially with the guys just want to bang as many chicks possible. A lot of them are afraid that if they give up their V card they just get dumped and become some kind of trophy for the guy, and also if they don't have sex they'll still get dumped so they give anal to kind of be a dirty middle ground.
PS I believe the MC is an asshole too in this situation