Kissing is a two way thing. You can be the best kisser in the world, but if the recipient insists on 'pecking' for instance, you won't get far. I blame any crap kissing with me on the man
Kissing makes me forget the time and that it's a job etc, so I have my music timed to remind me not to get carried away. Some clients are very good at getting me there, but I'll mention no names