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.
Look how bright the girls are. Against the backdrop of two hungry lesbians, the appearance of a dude chasing a bald man looks epic. The dude decided to relieve the hungriest of the lack of sex and parked his phallus in her pussy.