I've got the pierced tongue, to some girls that says both "I like to eat pussy" and "I like to stick needles through random body parts." Both of these things make chicks want to have sex with you. Skydiving releases endorphines which stimulate the pleasure center of the brain and it also says that you're willing to jump out of a perfectly good airplane just for fun which demonstrates your reckless personality which she has to protect your from.

True story:

On a date I once said that I felt like jumping in front of the next car and telling it to stop. Not like I was actually going to do it or anything, but she grabbed on to me and didn't let go til we went to sleep.