I have no idea what you’re looking for. If by “attractive girls in Chengdu who will sleep with me”, then I can tell you right now it’s not hard to find a prostitute.
If you want a pretty girl who just wants to sleep/date you for your green card, then i’m sure it’s also quite easy by using the bajillion dating apps there is to offer. That, or go to a club. With that said, this goes back to Jerry’s post. You’re in Western China and STDs are a bit of a problem here.
If you wanna find a real pretty girl who might actually like you, I suggest doing this the normal way and just do what you know and let it come naturally.
there’s my two cents. maybe someone should close this topic.