Once you take into account that women usually friend-zone a man before they've had the chance to have sex and men usually friend-zone a women after they've had sex (from once to many times). This isn't surprising at all. I've certainly been in situations where I've been aggressively prompted to participate in sexual intercourse with a former partner or current partner I was losing sexual interest in. I was never "made to penetrate" because I was explicit in my intent not to participate, but I can completely see how other men put in the same position being pressured to participate in a sexual act in which they have no interest/desire.
Just because two people have had consensual sex at least once, does not mean that both are interested in participating in additional sexual acts.
What's confusing about what I wrote? I've had many conversations about that observation with the sample of the population known as my friends and acquaintances and they generally agree. There exists the possibility that there are samples of the population for which this anecdotal information does not apply. This observation only needs to be valid for some of the general population to support under-reported figures for this type of sexual coercion.
As it stands, your comment is unsubstantiated as to why my comment is why you don't like these kinds of issues on HN. Does my observation make you uncomfortable? Or do you disagree? Or do you consider it to be an overly broad generalization. I'm been on HN for a while and have earned most of my karma from comments (not hitting the front page), and based on past experience, my comment isn't really that out of line. The only thing I see I could have done differently is to put a disclaimer that its possibly that my observation is overly broad and based on many instances of anecdotal observations (n > 50 && n < 100)
Just because two people have had consensual sex at least once, does not mean that both are interested in participating in additional sexual acts.