20% of girls would give BBFS to every guy who walked through the door, and 20% did not do it at all. The other 60% were YMMV, which means some of their regulars were probably getting BBFS but no one would ever mention it on a board or in a review, which is how the girls preferred it. When CV and TER went dark in Spring of 2018, BBFS started to be advertised openly, the customers seemed to like it more than GFE service regardless of the risks, and so the state of the business has come to where it is today, i.e., the girls have learned they can charge $100 more for BBFS, so more are offering it. Today, only about 20% of the girls are GFE only and never do BBFS with anyone (except their boyfriend - more on that further down). Another 20% are YMMV and a whopping 60% offer BBFS openly. There are still third-tier girls including it in the regular rate and hoping to get a nice tip, but if they get the upcharge, their net is double what they were making for an hour session four years ago. Some will still tip on top of the upcharge, so at the end of the day, a Kgirl with mediocre looks and average skills can make around $2000/day on six customers, thanks to BBFS.
You should also disabuse yourself of the notion that being the first customer of the day means you are getting her "clean." The girls that offer CIP do their best to remove all traces, but the break time to clean up is often short. If the girl has a real-life boyfriend (I have had over a dozen real-life relationships with Kgirls), and goes home at night from her incall to her living quarters, it is likely that she had sex with him before going to the incall in the morning. Many girls are too tired to do right by their boyfriends when getting home at night, so they do morning sex before they start work, and boyfriend sex is always BB, even with girls that never offer it at work. If you stick to girls that are GFE only, you have a 50-50 chance that she doesn't do BB with anybody, with the possible exception of her boyfriend, if she has one. If you are the second or third customer of a GFE-only girl who has a boyfriend, she is more likely to be completely clean than if you are the first. The problem is, they will never tell their customers if they have a boyfriend, so you have to play the percentages.