Several bodily functions that involve expelling fluids feel good in moderation. Pooping, peeing, sneezing, even vomiting can be nice if it’s the kind that makes you feel so much better afterwards. Try doing any of those several times in a row or once for a very long time, though, and it overtaxes you body and starts to hurt. There was even a paper I read (and just went and found it again) that studied the time it takes for the pleasure to turn to displeasure through repetition or duration.
Hephaestus seems the most likely to leave me alone. The gods are so capricious that I’d prefer to not have their attention.