Well, the woman does not look like a naive fool, who does not understand why she was invited to a man's apartment! And by the looks of it, let's say she is not poor - dressed well and not cheap lingerie! Apparently just love to fuck and not against a little adventure with an interesting man! For this theory, and says strongly developed anus, which clearly sparkled when she was bent over.
It's fun to watch, but it's probably even better in person. The shameless daughter, by the way, has very nice and sexy lingerie. And the father is a very even handsome man, so having sex with him is nice and desirable.