Sex with some stranger or new partner has its positives. It adds to the experience, even the thought of such a forbidden for many is arousing, counting on the stamina and imagination of the partner. Sex in the bar is somewhat relaxing and not as luscious as on the bed. This couple's anal sex and caresses deserve praise and encouragement.
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!