Definately all written by a male. It is not only disturbing, but it is outright sexist. The Bible exposition is worse than John Spong. I couldn't finish any of the articles.
It's one of those "a half-truth is more convincing than an outright lie" sort of arguments. Honestly one of the most disturbing "Christian" sites I've seen... and indeed, definitely written by a guy. Very few girls are interested in preserving their virginity by having anal sex instead.