An interesting question, and statistic…
Before we got married, my wife sucked at least a dozen cocks - having a cock in her mouth is one of her favorite things.
Her pre-marital oral encounters included a married pastor, me, two guys that one of her friends worked with, one of her close relatives, and her high-school ex.
There are another half-dozen that she sucked, at least, in the period of time we were engaged, during the time that our engagement was broken off, and again after we resumed our engagement.
My wife gives incredible blow-jobs - full eye-contact, dirty, nasty, sloppy, lascivious suck-offs, and she has a real talent for it.
She learned most of her tricks from the married pastor - they never had penetrating sex, for fear of pregnancy, and most of their encounters were her blowing, sucking, and tormenting his cock - I love hearing her tell me about those encounters. My second favorites to hear about are with the close relative.