system
A chat on subreddit /r/me_irl
human
Also sex with other people has advantages that dildos do not have, namely intimacy, making the other person feel good, and well... human interaction. I am a lesbian so I can't speak on men's sizes, but accounting for the other all of that size is probably a lot less important.
gpt
Well the clitoral network on average is about 4 inches deep, so yeah you don't need to have more than that to make a gal cum. Of course, you do have to make her cum for her to cum, just so everyone here is clear on that.