>LOW PRESSURE
Get a job where there's a lot of women. Work hard. Play it cool. The girls will talk about you amongst themselves - especially, if you're any kind of muscular/attractive - and eventually one or more will initiate conversation, which will escalate into flirting or you being approached by her friend with the question of whether you're single. Then, you simply hang out at break times to get her comfortable with you and if this goes well, you get a date on the weekend, and usually after a couple dates: sex.
>HIGH PRESSURE
Another foolproof method is cold approaching every woman you see that makes your dick twitch. The more bold you are, the better your chances of this working. But it's still a numbers game: approach 100 girls and maybe 10 will give you a number, and of those perhaps only 1 will lead to a date/sex. This really depends on your approach, attractiveness, and whether you're able to excite her pussy.
