It was only in retrospect after a lot of social learning that I became aware of all the times in my past that I easily could have been having sex, but wasn't because I didn't recognize the cues I was supposed to be picking up.
Was sex your goal at the time? How much time did you spend with the person(s) in question? Enough for it to be considered a long-term romantic relationship?
No. This
Sex Is Not the Goal. There is no goal. There is only the process: be who you are, and engage with what you encounter on that road.
described my outlook, and still does. I would have been happy to be having sex though.
And it varied; there are simply a number of people, who I spent differing amounts, some quite a lot, of time with, who in retrospect were willing to have sex with me.
Having been in the position of needing good advice, I agree with HughRistik that the advice above is mostly pretty bad unless you're the sort of person who doesn't already need the advice.
Clarisse Thorn recently posted a useful article about Ethical Pick-Up Artistry, bringing up a few basic critiques of traditional PUA and suggesting a few alternatives.
A proposal to formalize thisNot the same thing, but a discussion on forming a community to practice social artistry in general has been brought up on LW before, but I'm not personally aware of anything coming out of that.