Totally agree with you on that!! That has been my experience as well and is a great way to find out if she's going to be a great fuck or not. When you try to kiss a woman and she tightens up, purses her lips and doesn't seem into it, you can be sure that screwing her will be less passionate as well. Usually women like this are all business and professional so all she'll really care about is getting you off ASAP so she can get to her next customer. But if she enthusiastically greets your mouth openly with her tongue and keeps the mouth to mouth going for more than a few seconds, you can bet she's into it and you'll have a good time.
Unfortunately though, you don't find this out until it's too late. I'm trying to figure out a good way to deep french kiss first and then if you don't like it, walk out and find someone else.