Parr of Arizona, in Phoenix, AZ (Call them for a catalogue.) makes a product they call a "swim cup" which is a light-weight foam material covered by nylon. I wear one of these under my dancebelt and it gives a smooth appearance.
You can also get sheets of foam from most dry goods/fabric stores (1/4 or 1/2 inch thick) that you can cut and form into a jock-cup like insert. (Don't use a real athletic cup, not even the BIKE soft-cup: they can interfere with some dance movements, causing pain.)
Lining your dancebelt with foam and some different fabrics (try velvet) can change your experience when dancing, and bring out different moods. (There was a famous costume designer for films who would design an actors underwear to allow them to portray different moods.)
These kinds of topics should be takled about, and there are many male dancers out there who need a forum to discuss these concerns.[/i]