I was able to score my first fuck years back by being persitant and telling a girl I liked her when she seemed to have no interest in me. After getting rejected, I tried again a month later and we ended up fucking for about a year. Does showing a girl you want her, and when you want something you go get it, work all the time? Probably not since chasing isn't attractive, but there must be a way to frame it as "I'm not chasing, I just want you so I will get you." I feel like that's my mindset for a lot of things in life and if expressed correctly it may work with a lot of women.

You hear a lot of stories of how parents met, the mom wasn't interested at first, the father was persistant and got her, lived happily ever after, etc.