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.
That's a lucky guy, that girl needed his dick. Her ass was just begging to be inserted there. Not bad girlfriend knows how to suck, cum guy fed her and it all went like candy.