This is actually part one. I was working on part two yesterday, but didn't get a chance to complete it. In the meantime...
First, 63% is pretty abysmal.
Second:
"Very few women can reliably climax from penetration alone. Only 13.5% of women can always climax through penetration without external stimulation whenever they have sex."
Third, my conclusion is that focusing on sex is what makes up the difference between those unsatisfied and without orgasm and those with. However, that's not the entirety of it, as that's what my next article will be on.
What muddies things up is the fact that the orgasm gap doesn't close when the partners focus on clitoral stimulation. That's not 100% the solution.
The solution can be found in the Finnish study, putting an emphasis on orgasm, which was my conclusion here.