
The artist drew the seme bending his fingers inside the uke backwards, which wouldn't make him moan in pleasure
http://www.mangago.zone/read-manga/eunsoo_s_good_day/uu/d_chapter-3/pg-8/

Ok so I researched a bit more, and you can get pleasure from the anus because it still has nerve endings, however the prostate is definitely the hotspot for the pleasure zone.
I got this from an article: "Initially, prostate stimulation might make you feel like you need to pee a bit, but this is just your body readjusting to a sexual response from stimulation."
I'm not sure what it would feel like without the prostate, and in fact women don't have prostates so I'm not sure if it would be ticklish or not.
One thing that always annoys me is then the artist draws the prostate on the WRONG side of the body.
The prostate is ALWAYS between the rectum and the peen because it controls the semen flow in the urethra.