I used to do this also when I first started out, I have no other options lying around, so I tried to f-close every girl I went on the date with even if she's a bit below my standard. I had this mindset "okay I cant keep her interested forever and she might not want a second date with me, so why not just push it as far as I can"

That is very narrow vision. I did not think about long term. The problem with that is appearing as easy to her. If she can get you to fuck her within the first 2 hours of your meeting, pretty much means she can wrap you around her finger easily later on. Hence she loses interests because there is no challenge, just like with us guys.

Now the best way to do this is make her horny but do not get physical with her. Told her you dont fuck on first date, then turn her on with your eye contacts, kino, and words. Don't do anything more than a peck, no heavy make out. You have to take charge though, make her think that you choose not to fuck her, not because you don't have the guts to escalate. Make her think that she almost got you but you have great self control and pull back at the last minute. She will try harder next time she sees you.