Nude art or erotic art?. They may appear to be very similar genres. Here is a couple of simple definitions:
erotica
Erotica: Not nude?
Thinking About Nude PhotographyThe Beauty of the Erotic in a Facebook World
Erotica but not nude? A seductively clothed model can be much more erotically attractive than the completely naked figure. Unfortunately, it can be difficult to combine the erotic with the aesthetic.