Piggybacking on wxigz's post, my best friend's a literal nympho, and I've always made it a point to befriend girls I went to school with. Trust me, from all the girl talk I've heard from friends and family members, girls want the D just as much as dudes want the V.
Most Yandere's are pretty nice outside of their crazy moments. Doesn't mean they're not crazy as shit though.
I'm speaking from personal experience here, trust me, it's not fun and it's not worth it.
@SomeDonkus It's determined by the demographic of the magazine/readers, not by the story itself. If someone ran a full on Shojo style romantic drama in Shonen Jump it'd still be considered Shonen and not Shojo.