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Let's say you just want to have sex with a girl, and just not ignore her after, but you also don't want a relationship, how do you go about just having sex with her?
Something one of my friends (male PUA) does is pick up the girls using his PUA moves, has sex with her and gets her number the next morning. If he doesn't want to have a relationship with her, he calls her the next day or a couple of days later and is just like "hey how are you? Was nice to meet you the other night..." Almost always, the conversation kind of fizzles out because they haven't built up enough comfort with each other and he just kind of says something like "ok well it's been awesome meeting you, but my mate has just turned up and wants to hang out so I'll speak to you later on? See ya!" The girl then seems to get the hint and doesn't contact him again and he doesn't contact her again.
I don't know if it's foolproof but it seems to work for him - he doesn't look like an asshole to the girl, because he has actually followed up with her but because they can both tell there is no propoer attraction there, he gets away without having to have a relationship with her.
Hope this helps a little!