Here’s the problem in a nutshell: pain is an indicator of something gone wrong. You are more than welcome to suggest that there is some pleasure mode that can be associated with pain, but you have left the realm of the natural body and rewired your mental programming to get there. It is not “the way you were born.” Pain means that something is being damaged or has been broken and needs time to recover. There is nothing “good” about pain except as a warning indicator to protect the body from further harm.
This is not to suggest that pain is not useful. Obviously, for many reasons, pain is useful and necessary. The bloody catharsis, for instance, uses pain as a release. But, make no mistake, there is no “pleasure” in it. It’s not supposed to be fun. It’s not supposed to provide erotic tantalizations. The release of sexual fluids from either gender during such a process is no more an indication of pleasure than the erection on a dead man after being hanged by the neck.
Pain is not a good thing and it was never designed, biologically, to be so. It is the smoke alarm of the body. It is the safe word, so to speak, in the ‘real world’ of senses and sensations.