The linked study doesn’t measure sexual stimulation, only touch, pain, and heat. The study also found that the foreskin was more sensitive than any other area, which supports the prior commenter’s point.

As far as I can tell it addresses the mechanisms proposed by the parent comment.

If the claim is specifically about reduced stimulation during sex, that's a different claim. I'm simply saying the initial explanation seemed like bullshit

In general, if a claim is easy to verify, someone has verified it, but the US is also somewhat prudish so making the research more explicit might make it less likely that the research happens in the states. If there is an existing study that says this claim is correct, feel free to link it.

Respectfully, this is a case where a lack of "field experience" combines with asking AI about peepees, and it gets weird after that.

Like another commenter said, this is a small (62) group of men tested for stimuli that don't appear to resemble sex.

To be blunt, I think it is apparent to those with experience that uncircumcised penises are significantly more sensitive than circumcised ones. If you wanted to test this - get a big sample size and simulate the 3 common types of copulation in a standard way (lol).