I too got the impression from past videos that Allegra was upset that people judged her by her looks while ignoring that she is a good mother. Of course, when you see the videos and pictures, with clear intent to suggest she has very loose morals and is easy, they tend to suggest otherwise. Allegra is very proud of her looks and she has every right to be; her manner of dress in public is not one looking to hide, but looking to flaunt everything. So while she would like to be seen as a good mother, the persona she often chooses to project would be more akin to an adult film star. In reality, you can be both, IMHO.
So the question remains, why does she pose for pictures and videos engaged in sex? When you rule out the relatively minor money end for someone who apparently already has means, the only answer I can find is that she likes seeing herself, not only as a sexual object, but as the willing recipient of sexual advances. Perhaps she also embraces a inner slut?