This is not a new idea, but I've just recently realized the true potential of this notion. And I can honestly say that it greatly assisted in all of my recent hook-ups. If a woman sees that another woman holds you in high regard, or even better, is sexually attracted to you, it is typically worth so much more than anything a male friend can do for you.

"But how do I find a wingwoman?" you ask. A great place to start is the girlfriends of your buddies. Make sure you have a good relationship with these women. You may not necessarily like them, you may think they are "stealing your buddy" away from you or whatever. Fuck that. Use them to your advantage. If they see that you are an awesome person, and they like hanging around with you in a group setting, then they should be willing to help you with your game.
Directly convey to them that you would like help meeting new women. It took me far too long to take this approach. When going out with a group, have one or more of your friends' girlfriends actively talk you up. Of course, the more natural and less matter-of-fact they are about it, the better. EDIT - I meant for your friend to be present in these situations, in a group setting. Mostly for their own comfort.

Precautions

Of course, make sure your buddy whose girlfriend you are asking to wingwoman is well aware of what is going on beforehand. Depending on how comfortable everybody is with the situation, the girls can even be physically flirtatious with you. My best friend in the world has been great at allowing his girlfriend to aggressively flirt with me in public to my advantage. He has excellent game himself and can appreciate the tactic. Others may not be so open... so tread carefully.

The interest these women show towards you is the greatest way to demonstrate your high value. Also, jealousy is a great motivator for a lot of people. If a target sees women all over you, usually no matter how attractive she is, she starts to question why you are showing interest in these girls instead of her.

New Tactic: Using a target as a "wingwoman" (Disclaimer: this could go terribly wrong depending on the girl's level of confidence, so you have to be the judge.)

This one is a little bit of reverse-psychology gaming that I've been working on. It's still in the rough draft stages, to say the least. And again, it may not be a new concept (I haven't read any books on this stuff, I just casually browse this subreddit), but I find it works pretty well.
This is sort of a back-up plan for if you start to suspect a girl you are gaming (but haven't yet done anything with physically) is losing interest, particularly if you think she perceives you as overvaluing her compared to her evaluation of you. Basically, if you suspect you're starting to look like a chump in her eyes. So long as you are still on good terms, see if you can get them out to a club, or something with lots of people like that. Then, when you are out together, be flirtatious but aloof - suggest that she help you with other women, much like you would with your friends' girlfriends as mentioned above. If they had suspected that you were below them, this can topple their barrier. They go from thinking they are the queen to the pawn. As mentioned above, the girl has to be confident for this to work!!! EDIT: The reason I say she must be confident, is because if she isn't, she may just think you straight up aren't interested in her at all, and not pursue you even if she actually was interested in you. If you judged right, this can pay off in either way:

1) Her air of superiority is shattered and she sees that you are not dwelling on her, but rather playing the field and actually a pretty sharp guy. This can trigger some jealousy, and attract her to you.
2) She actually helps you as a wingwoman. If she truly has no sexual interest in you, then she should be willing to help you find someone else.

This second play needs work in actual theory, field testing, and how I'm conveying it... but let me know what you think, or if you've had any similar tactics work for you! Thanks for reading!