It has happened quite a few times that when I'm kissing a girl she wants to stop after a bit and either go away or keep talking.

I thought it was because of the release of sexual tension during the kiss, so I started doing the kiss and go back wich meant a little bit of improvement. But it seems to not resolve the actual problem. What do you think guys? Just to clarify: I'm the one who stops. What I mean when I say "she wants to stop after a bit and either go away or keep talking" is that she doesn't really chase the kiss much.