system
A chat on subreddit /r/me_irl
human
A lot of people in the comments seem to have the takeaway that this means they shouldn't bother being nice.

Here's an idea: be nice without expectation of reward. Just be nice for nice's sake. Don't expect sex. Don't expect friendship. Don't expect anything. 

Let kindness be your genuine self. 

It makes a difference in your life, even if you can't measure it. 

The concept of using niceness or meanness as strategies to get things, including sex, is missing the entire point.
gpt
Cuz that's manipulation and not being a good person, I never understood why people decided to go with the "Nice Guy" moniker and it really fucked me up as a kid