Sounds to me like a challenge they'd happily accept. They're like the Spartans of BJs.

So I lazily glanced around earlier to see if there was any data, couldn't find anything all that strong in terms of sample size etc. One psuedo-survey was going on about how common oral sex is in general, and noted that like, in the 60 (happy and willing to talk about their sex lives) couples between 18-45 they surveyed, 30% didn't do it, and those that did tended to do it like 5 times a week (or was that month? I cant recall the frame). The small subset of gay couples had a higher average but not by tooo much, at like 6 or 7. Straight women tended to go down more than straight men, though straight men claimed greater satisfaction/arousal from giving oral (women were at like 25% who enjoyed it, vs 52% of the men).

That was a younger contingent, non-married/long term, and a tiny sample in general, likely from one particular region of the world. Likely a region fairly open/accepting of all this stuff, given the topic of the survey. I'd bet the numbers skew WAY differently amongst boomers and genX even -- even many older millennials are sorta prudish on this front.

But even with those really wobbly data points, its not quite "for every woman that doesn't, there's one that does", it's more "for every 10 women, there're 3 that don't do it, 1-2 that enjoy it, and 5-6 that tolerate it now and then".