From the front as well as from behind - well, absolutely flat woman. Only one advantage is obvious - well-designed orifices. And of course due to the flat buttocks it's very convenient to pull your partner in the anus, even without bending her over. And I don't see anything else interesting in this lady! The man is basically of age, so probably the determining parameter for him is the age of the woman and the possibility to work her anally!
Homemade porn is a lot more interesting than actor porn. Here, too, there's real fucking, real emotion. He's really enjoying her pussy and the sight of his cock diving in there rhythmically. And these words of hers at the end - I just adore you! It really gets to the balls!