Increasing the numbers and never asking a question so blunt it means they're going to reject you.
One thing that is interesting is that the most successful people with woman I know don't treat the same things as rejection as other guys I know. If a girl acts up, they keep going. If a girl pulls away from a kiss, they laugh and keep doing what they do for a while and then try again.
I'll give you an analogy, once I wanted to go hitchhiking to save some valuable time. I was scared ****less at sticking my hand out because I was afraid, what of? I don't know... rejection. But then I decided to play a game, imagine the number of 30 and count down every time a car passed. Y'know what? I counted down to 19 then I got picked up. Then the next time I tried I was told the best way to get picked up is to turn around and face the driver and stick your hand out. When I did this the second car I saw picked me up.
I've tried hitchhiking since and I don't automatically get picked up, sometimes I still ***** out, even though I know it doesn't really matter. I can't control their opinion of me anyway, so why does it matter if they don't want to pick me up? They're lucky if they do becuase I'm good company and the coolest cat they've ever been in the presence of. The fact is if you just treat every woman as a potential lay and remove any guilt from the fact you want to **** them, you'll get better responses.