Okay, I'm in 8th grade and I'm going out with someone (a girl)

What makes a girl laugh and what would help me get more BEST FRIENDISH than I wanna do you because I really in no way want to imply that. I mean I know theres a line but were would women draw it between funny and gross. Im stumped because my friends talk about crazy stuff and im pretty sure the girls wouldnt know what half the stuff we babble about means. So the question, cut to the bone is, what is the line between discussing unny jokes and discussing gross jokes. Please help