Lol, again skewed by the demographic. I.e. more lower end phones. Younger users of lower end Android phones have more sex than old iPhone users shocker!
The socio-economic argument is flawed because one has to compare like for like. As you well know, Android is a fairly open platform with many different phones from low-end to high and therefore attracts every kind of punter. IPhone is only a high end device so obviously attracts only high-end...