I can't blame you, I have the self restraint of an untrained labradoodle... as well as affectionate as an untrained labradoodle... Which I guess makes me one of those "easy to fall in love with someone" type people... slash labradoodle...
Hence my 2-3 visit policy. It just makes my life easier.
There have been exceptions where I've seen a girl dozens of times and had no thought of anything other than our sessions, but if I've recognised a trend in my behaviour then best not to push it.