What are Crotchless panties?

Crotchless panties have no material between the legs. No covering of the vagina area.

They are not pointless. The POINT of any sexy themed panties, is primary to be used in the bedroom. In the end panties have to be removed in order to have sex. Why wear underwear WITH crotch material for that matter either? It's purpose is to be able to keep them on during sex: the reason you bought them in the first place.