I was surprised too I mean is that really the case for them to be more sexually aroused and produce orgasm? In reality, does it really happen too?
No honey, it doesn't work that way. Stimulating it correctly is pretty hard in the first place and if you do it right it's more of a nice continuous feeling. Even woman almost never cum just from penetration. If you wanna have a nice time you have to stimulate your partner form the front.
This BL explained it pretty nicely if you want some reading recommendation: http://www.mangago.zone/read-manga/the_good_teacher/
I flipping hate when BL acts like prostate is some magical button you need to press for instant orgasm.