The link to the tutorial contained very specific, unusual names for the positions. Therefore, it provided a common frame of references for thread participants to select their favorites. I have not searched for sexual positions online, ever, and do not know if the names listed in that tutorial are industry standard. At least they were not known to me when I reviewed the tutorial and scanned the answers with posters' preferences - Amazon, etc., I had never heard of them, so these names are at least not known to some people, which makes me suspect that perhaps they are not industry standard.

To the extent that the link provided a naming convention, accompanied by very clearcut explanations, it enabled the participants on the thread to avoid lengthy verbal explanations of what they like to do in bed. They could just mention the name of their favorite position. So, it was very useful and helpful in organizing the exchange of information/preferences/tastes - although I could not participate due to the severe lack of variety in my repertoire, I could, as a by-stander, appreciate the taxonomic value of the link.

And inquiring about people's medication dosages is less of an "invasion" of their privacy? And many people not only welcome such inquiries, but post their dosages in their signatures - I just stopped doing that a week ago.

For that, DocJohn provided very clear guidance back in 2007:

While DocJohn said it about the forum as a whole, you can, for your personal purposes, choose not to read the threads that cause discomfort. I take it, "disturbing" in DocJohn's welcome letter and "uncomfortable" in your post are close to synonymous. Maybe I am wrong... but they are close enough to say that the welcome letter applies to your feeling uncomfortable. I personally feel uncomfortable every time I see descriptions of cutting. Extremely uncomfortable. But I realize that I am not to silence the people who talk about cutting just because I happen to be uncomfortable. My level of comfort should not be a standard for other people's self-expression.

That is very true. It does make me feel inferior. But the long thread about exercise on which people post how many miles they have walked today makes me feel equally inferior. Plus, my feeling inferior, just as my feeling uncomfortable, should not silence other people, whether they post about intricate sexual positions or high daily running mileage.