I mostly just have sex with my girlfriend, but when she is on her period I will do it once or twice that week. I really enjoy doing it to porn because I only get like once a month, but I prefer the real thing.
I would say that above 4 times is venturing into the 'a lot' category. I think it is more of an impulse such as sneezing, or sleeping than pleasurable. It is a rather pleasurable impulse. I often have wondered if some guys experience better quality pleasure than others or if most men generally receive the same level of pleasure. If not, perhaps that is why some men are more obsessed with sex than others. :1orglaugh