We have all had the times when we just didn't click with the other guy. Either because he didn't turn us on. He sucked your tongue down your throat and wouldn't give it back, or was stinky, or you thought he was going to rob you, or you thought the wife would call, or .... or.... or.... or....
I think the thing is I'm not willing or able to take the time it takes to weed out the ones I don't want. My big head says your not going to do this hook up thing any more, and then when I'm horny and my little head kicks in I am crunched for time, and I take the first thing that comes along.
I wish I could just hang it up. Stick with the porn, the free chat line and the hand. I usually feel better about that in the end anyway.