You would have to be pretty erect to put on a condom, and you would have to stay that way to keep it on. Eventually, your erection will go down and the condom would work its way down and then off of your penis. The lubricant would escape and add to your problem, not to mention that your penis would be sharing the pouch of the dancebelt with a scrunched up latex tube. Icky AND uncomfortable!
I confess that I have the problem with leakage, which I have solved by only wearing Capezio quilted dancebelts, or WearMoi dancebelts, which are padded. The quilting/padding are absorbent, so nothing ever makes its way out of the lining of the pouch.
Also, these types of dancebelts smooth out my natural contours. Whether I get an erection in class or if my penis loses it's upright position, neither is noticeable, particularly with the WearMoi. [/i]