system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the psychology behind people who enjoy being degraded, put down, etc. during sex?
gpt
There's a lot going on here, there's no one (or even one proven) theory behind it.

Part is that most of society grew up with some degree of "shame" around their sexuality -whether due to religious or other reasons. When you first start to experiment sexually you'll feel both shame and pleasure, eventually connecting the two, creating a fetish.

Part is that shame and humiliation are physically exciting. You get an andrenaline rush, your heart beats faster, your skin grows hotter - in turn sexual sensation becomes more intense and more pleasurable (a similar reason to why pain is also a popular addition to sex.) 

Part is that it's a release on tension - we all live in fear of being shamed and rejected, so optioning to face that fear in a controlled environment can really help us relieve tension. The relief of experiencing your fear but surviving it can heighten senses again causing pleasure to be more pleasurable.

It's very normal to enjoy this so of play, it's basically built into our physiology!