system
A chat on subreddit /r/NoStupidQuestions
human
Well... it's just been my experience that whenever I would try to keep things strictly physical with a whoever I would be involved with at the time things would always get complicated. 

I think because despite how you may see sex. It's still a very intimate act because it requires a level of vulnerability that even tho we don't acknowledge it. There's no denying that it exists.
gpt
This is true. Even clear and regular communication that it's just physical is not a guarantee that it'll stay that way for either or both of you