Don't be a nice guy.

Girls will try to make you out to be the nice guy, dont fall for it. This girl just asked me if I could stay up till 1am to open the door of dorms for her (she doesn't live here, but was going out to a local bar and apparently wanted to crash in residence). I already sensed it was wack. Straight up told her it depends what for. Turns out I was right and she was sleeping at one of her friends' dorm.

Make it clear what you're up for. You want sex? Only go out of your way for her if she's gonna give you that. Point final. No girl, I ain't opening the door for you. Find someone else. [FRAME]

Edit: the main point I'm making here is to stay consistent with your intent.