Too much of I personally know one of the mamasans and two of her providers in this area, and have known them for a long time.
They tell me that at lest 30-40% of the new girls, fresh off the boat from Korea (especially the ones from North Korea) are willing to give . They start by rubbing the tip of your johnson against their clit, and after a while it just sort of slips right in. It's called competition, and they do it in order to establish a following and get lots of good reviews. The girls are required to bang 10 men per day, and the mamasans push them hard. Calculate how many months your favorite girl has been in the industry, and start counting. 10 men times 6 days per week times the number of weeks they've been in the industry.
sidster69 said it well "Just takes one for an epidemic" going by the name of Soda Pop that I hooked up with through Night Shift.
One minute she's sucking away and before I know it, she slides up, grabs hold and I'm in!
I was too surprised to protest or do anything, but both the big and little head shouted out "God that feels so good! I've been laying low for awhile hoping against symptoms.