I doubt there's much science behind this. Only adult males can really A/B test this, and circumcision of an adult penis may very well risk damage. There's no reason to think uncircumcised males enjoy sex more than those circumcised in infancy.

In parent it was about the "potential", which you can't reach anymore if you are circumcised. Whatever "potential" means. Could just be not having to use lube.

It remains genital mutilation though.