Its up to the lady the services she provides, if the lady you like the look of doesn't offer the service you want, then you need to carry on looking.
There are lots of reasons for it, but its totally up to her and how she feel, it could be the click thing, the boyfriend thing but most of the time it will be because men don't know how to brush their teeth or have any idea on dental hygiene, if your a smoker thats another reason you won't be feeling a tongue lingering on your lips....
I offer French kissing, I don't get it when people don't kiss, its what gets the heart racing but everyone is an individual and makes their own choices. I will ask all your gentleman out there that wants such a services to be fresh and clean and don't be afraid to ask for some mouth wash.
Happy smoooooooching x