Oh, I don't think it's too big a puzzle. Sweat or no sweat, it's obvious you've got a nice body, that you obviously take care of... one that will presumably be washed and smell better the next time they see it if you take them up on their offer.

And if it's like my gym, you're not likely to run into these particular people anywhere else....so they've got to take their shot with you while you're there.

Can't say I'd mind getting hit on in the gym more often...but that may just be because I like being hit on