There's a fine line one treads when people wearing anything less than the sort of clothing one might wear to a formal dinner are involved in art: Where does something cease to be art and start becoming un-artistic pornography?
It's very subjective. Clearly, you can have a girl wearing quite a lot of clothing yet still, through posing and camera angles and selection of wardrobe, make something that is just trashy and probably quite offensive if you saw your 12 year old daughter in. And clearly naked people feature in a number of pieces that are the pinnacle of artistry, all the way back to Venus Figurines.
I went to a car show one time because a model talked me into it. She said it was a great opportunity to network. And I brought my camera because it would provide a way to strike up conversations with people. And when I got the film back, I realized that it was just trashy and that I really didn't want to go back to that sort of show. Not my thing.
However, I feel that I proved a point to myself, by accident. Of these two pictures, I feel that the one with less clothing is less trashy:
Another time I realized, after I took the picture, that I was exactly 180 degrees from a trashy shot:
See, from this angle, nothing's really showing. From the reverse angle, there's no way to make it look classy.