I have this "problem." It isn't orgasm, though. Î leak seminal fluid into my dancebelt. The thong presses against my sphincter, which in turn stimulates my prostate. I'm in dance class while all this is happening, and I'm usually not aware of it. (No, I don't have an erection all through class.) Only later, when I change, do I know.
This is a nuisance to me, not a source of pleasure. I'm afraid it will show through, and spot my tights, but fortunately that's never happened. More practically, I have to wring and pound my dancebelts when I wash them to get the stains out, and this process wears them out very quickly.
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