Many women do more than that when they're alone with themselves. But the contrived rules do not allow them to relax with a partner. It is not without reason they say, that a smart woman has it in her head, a fool has it in her mouth. I even know men who categorically reject such liberties.
I just fell in love with these beauties. Not everyone can work their mouth so masterfully. The guy in the video is just lucky. All the girls are like a single organism striving for pleasure. Who helps with the fingers. Who guides the genitals into the desired orifice. I think the actors had a lot of fun doing it themselves.