Didn’t know that, was literally just the first source I found.

Wikipedia’s article has a section on it, with about 4 difference sources that all seem to conclude the same though. Maybe they’re all bug circumcision propaganda, I haven’t really looked into that part of it.

Here’s a study on it. Basically the foreskin nerves are “touch” nerves, and all touch nerves get reduced sensation with arousal. The number of those touch nerves drops significantly with age as well, with a 90% reduction by the time your 45+. It’s other nerves (mainly in the corona and near the frenulum) that are focused on vibration and temperature, which mainly contribute to pleasure.

Ultimately the “ejaculatory latency time” doesn’t show a difference, even across various reasons for a difference in the quantity of touch nerves.

The sensitivity loss thing is mostly an internet myth, most studies on it show no difference with some studies reporting increased sensitivity instead. The foreskin does have nerve endings, but those are mostly “touch” nerves and aren’t really the nerves that contribute to pleasure/arousal.

As anecdotal evidence, I have a family member who got circumcised as an adult due to medical issues, and he’s very positive about it. I haven’t questioned him on if he had a change in sensation, but I know he’s happy with the outcome.

While I’m talking about benefits, I’ll mention it lowers penile cancer risk, reduces the chance of UTIs, reduces the chance of some STDs, and prevents phimosis/paraphimosis. Only real negative I’m aware of is the procedure itself.