How do you maintain your sanity (and not get attached) to someone you're just hooking up with?

I've come to realize that, at 34 (and never having a relationship longer than a few months) that I am undateable. I don't know why, and I stopped trying to figure it out. If you want some more background about me, I've written about myself before here:http://ift.tt/29laY0f I figure, my future is just random hookups with no possibility of a relationship beyond that. I'm not the "whoring" type, but I figure if I am going to have any sort of human interaction, I have to get used to it and accept it. If I hookup with travelers/visitors, well that's easy enough not to get attached since they won't stick around anyway so no worries about me wanting to maybe see them again and them not wanting to ever talk to me again. I did exactly this this past weekend with a kid from Seattle here in town visiting his family.But what if I end up actually liking the person. I already know they will never want to see/talk to me again after we get our rocks off. I try to maintain that mindset when I meet them that, no matter what, I can't get attached to them or see any sort of future with them. But part of me will always want a longer term relationship - even if no one feels the same back to me.So I ask those of you comfortable with random hookups and ghosting on the dude afterwards, how do you do it? Do you just dehumanize them and see them as a hole to get your jollies off in? Do you say what you think they want to hear to make them feel good and then turn it against them anyway (for example "Yeah, we should totally hang again!" and then lose their number). Should the other party just expect that it's a one time deal and if they want more, then that's their own problem?I'm just not sure how to get into that mindset, but I know if I am going to be relatively happy/sane going forward, I'm going to need to accept and develop that mindset for myself.