I'm a Jewish woman of Iranian descent, and I've frequently heard my mother and brother in law say that the wearing of the chador doesn't necessarily stop men and women from whoring around. They're just not as open about it.
The thing is that nowadays modesty in women is no longer considered a virtue. Unfortunately, women are encouraged in our popular culture to have lots of sex partners, and if they don't, they're considered damaged goods. One time, this college roommate of mine said right to my face that she heard men tell her that if a woman has not lost her virginity by a certain young age, then they think something is mentally and physically wrong with her. And mind you, this girl was in no position to talk, as she was at least 60 pounds overweight.