Once when I was masturbating I had to have a bowel movement. I didn't want to stop, so I just went in my underwear.

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What do you think about when you masturbate or have sex? Would you tell your significant other if they asked?
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Once when I was masturbating I had to have a bowel movement. I didn't want to stop, so I just went in my underwear.

I then had the best orgasm of my life. Since then, I have repeated this act a couple of times. Has anyone else ever done this? Is it not recommended?

The reason this unusual practice is pleasurable to you is the same reason why some men enjoy anal stimulation: there is something about the nerve endings of the rectum that can generate intense pleasure when they're stimulated during an orgasm. Aside from the obvious personal-hygiene issues, I don't really see anything wrong with this – although you will make much less of a mess if you use some other object to create the stimulation rather than your own feces. See the JackinLibrary essay on anal stimulation for details. (Note: This article is for mature readers only.)