https://www.vice.com/en_us/article/men-explain-why-they-were...We don't have many examples of adult men undergoing the procedure to say which way feels better, since any medical problems would show themselves before they reach adulthood, and nobody really wants to get cut needlessly. The above link follows 4 men who did have it done as adults after they started their sex lives and the results range from "fine" to "horrible". It should be noted that circumcision was pushed in America with the purpose of stopping masturbation, i.e. a purely religious reason [1] (AFAIK none of my circumcised friends have refrained from masturbating), by John Kellogg (he invented cornflakes for the same purpose), and [2] has some excerpts from his book, including "burning the clitoris with acid is an effective means of curtailing female masturbation". I find the idea of mutilating the genitals a bit horrific, even if you're basically cutting off an organ that isn't strictly speaking keeping you alive. Humans are pretty resilient and you can cut off a lot of small parts before you actually start seeing real functional impediment.
I will note that [2] also notes that people living in hotter, wet climates (Jews, Muslims, some tropical island tribes, etc.) practice it for purely health reasons, since in the time when you couldn't take a shower whenever you wanted, the secretions that collect under the foreskin can lead to inflammation. Today if you live in an apartment and can take daily showers, I think spending 5 seconds to clean your willy is a better alternative to risking circumcision. Some boys unfortunately need it done, but that's no reason to cut off everyone's en-masse. Similarly, there was a time when children had their tonsils removed routinely to prevent diseases [3], but with today's improved standard of living that's not needed.
[1] http://www.cirp.org/pages/whycirc.html
[2] http://www.historyofcircumcision.net/index.php?option=com_co...