>>5990243...Is it really that weird that they do?
I mean, they are usually somewhat anatomically correct with a slit or tic-tac. Most don't have roasties, but you get the idea. Better to cover that up than to have to answer questions that make you look even more awkward in the hobby.
If you doll wears pants, they're not necessary, but with a dress, yeah, best to do that.