Perhaps I just don't visit the same girls but this is incredibly rare.
I started off punting before the initial EE wave, when kissing and OWO was verboten. The EE girls caused more girls to start offering both, but I've had no indication in that time that they are more likely to offer BB at all, even after having regulars that I saw over years.
The only time it ever happened during a regular punt was with a Brit, I declined and never went back.