My advice is to scrap the leo entirely and just wear what 98% of all men at all times in every part of the planet wear to ballet class - black tights and a white t-shirt, with a dancebelt under your tights. If you feel compelled for whatever reason to wear a leo, then please do not omit the dancebelt.
The dancebelt will give you the support you need to keep you from injuring yourself, but as to the bulge, get used to it. There's no way you can help having one if you are a man who wears a leotard or tights, or both. Your instructor has seen worse (or better, if you take my meaning) but she is not interested in seeing that portion of your anatomy, and it will probably come as no surprise to her or the other women in your class that you are male.
-V-
[/i]