Sandfort... was a serious social scientist who wanted to understand the truth of the matter by going right to the sources... with emphasis on the plural.

I'm not implying that Sandfort deliberately fudged anything. But he never claimed that he was taking a random sample of men involved with boys. He was asking for volunteers, and I assert that the vast majority of men would not have volunteered to show up if they were involved with boys who they thought might express serious reservations about it.

Those boys did not say the sex was simply "OK,"

When I read their descriptions that's what most of them say to me.

they saw themselves having a legitimate romantic relationship.

It was at least a very important friendship to them, but whether they viewed it as romantic is a serious question. Whether they were actively interested in the sex is yet another open question. I think a couple said so, out of this self-selected sample.

They did not, and certainly would not, support measures of prohibition.

You're changing the subject. But how many of them would today support measures of prohibition is not clear at all.