Usually, dance belt ejaculation problems are accompanied by erections. How much warning did you have that you were going to have a problem? Were you thinking purient thoughts at the time? If so, maybe visualizing a 300 pound female Russian gym teacher with a moustache and really bad B.O. could help calm you down. But if it was just dance belt friction, you might have to consider finding a dance belt that doesn't rub you the wrong way, while still being tight enough to support you. Instead of an incontinence maxi-pad (suggested by the previous poster), which could could look quite strange if you wear tights, have you considered wearing a condom under your dance belt?
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