Are you a bit or just never go out? If you would get out more you would realize not everything has to be scientific. It's just dancing and people do it cause it's fun. Dudes twerk too, how does that fit the lordosis definition?
Op asked a question. Root post answered the question. I added the scientific support.
If you don't think that there is a huge amount of scientific interest in human sexual behavior, you are the one who needs to get out more.
We're also not talking about twerking. That is a dance that is appealing because of it's similarity to the mating behavior that is the answer to ops question.
Because it makes it seem like you are thinking of the people involved first and foremost as objects of biological study, and that you are the kind of person to whom that sort of thinking comes most naturally.