What do you base that it’s meant to be pleasurable for both on? At its core it’s for reproduction. Otherwise you are likely basing it on something people have ascribed to it but that’s not the standard that most folks carry anymore. I don’t know that they have to have a reason that makes sense to anyone but them
Reproduction?! its good for me to get some of these perspectives, sometime's I'm just blindsided by these kinds of things.