Okay. Challenge accepted.
6 - If you're hitting up PUA sites, it's probably because you've gone a long time without romantic involvement, and you're getting desperate. This is perfectly understandable: sex drive is deeply seated and can become overwhelming if it's not fulfilled. Unfortunately, at a certain point, people start to reify sex: it ceases to be about attraction to any one individual, but simply about "getting" sex from anyone who's just appealing enough.
Unfortunately, people are very perceptive, and if you're desperate, they'll notice. You might be able to pick up other desperate people this way, but unless you're exceptionally lucky, your relationship will be brief and unsatisfying. The truth is, good relationships are somewhat hard to come by, and we're assuming that what you want is a good relationship.
Just for added concreteness, let's explore some of the ways in which desperation for sex will screw you (pun intended). You'll appear overly eager; you'll be visibly nervous; you'll hit on everyone, including people who, if you weren't so desperate, you would realize are not appropriate for you and your circumstances (i.e. they're not your type, you're not their type, you have nothing in common, etc.). When they reject you, you'll feel even worse and more desperate, perpetuating the cycle.
So, your first task is to forget about getting sex. This is difficult, but doable. Use all that tension to fuel your pet projects, to go out and meet new people (men and women alike), just generally distract yourself. Hire an escort if necessary (just remember to treat them with basic respect and decency!). Meditate. Do primal scream therapy. Go on a crazy adventure. Whatever - just find something that takes your mind off sex and go for it. You'll find you're a lot happier for it.
5 - Still with me? Good. Now that you've got your sex drive under control, it's time to start flirting. Note: flirting, not seducing. Flirting is playful and casual and is never overtly (and sometimes not even remotely) sexual. As a rubric, you should be just as comfortable flirting with the gender you're not attracted to as with the one you are (if you're bi, then you should be comfortable flirting with your grandmother). Indeed, you should flirt with everyone - male, female, or otherwise. It helps you build important social skills, makes people want to be around you more, and helps you clue in to signs of attraction in others (trust me, you'll notice 'em eventually if you pay attention (and if you're neurotypical - I don't know enough about people on the autistic spectrum to comment, sorry)).
To give some idea of how flirtation works, the most common form of flirtation is humour: making ironic observations about current circumstances, obvious shit-talking, telling jokes (if you can pull them off well), etc. Stay positive; avoid really bitter humour, or follow up nastier observations with positive comments. Physical contact is another common one, but this is for skilled practitioners only - the slightest miscalculation can turn your friendly hand on their shoulder into creepy, unwanted touching. Third, you can ask people friendly questions about how they're doing, then either share their good mood or commiserate with their frustrations as appropriate.
Occasionally, flirtation does turn into making a date or even having sex. This is a delicate practice, involving a gradual escalation while maintaining plausible deniability. I don't suggest trying to initiate this at first; just learn to notice when it happens, and see if you can keep up the game. Again, this takes some practice, but if they're already hitting on you you're likely to get the benefit of the doubt for smaller mistakes. This is where the water metaphor becomes most crucial: the game works not by pushing, but by opening up and revealing interest in subtle ways: through body language, tone of voice, slightly sexual but still playful comments. With practice, you'll learn to recognize and accept these openings, as well as to offer your own in return.
To be continued in a bit...
You don't seem to have distinguished flirting from ordinary social interaction. Are you certain you're using the term in the standard way?
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.