The acroposthion

One thing fascinated me about Russia - and that was how many men had such long foreskins.
Since foreskin keeps the head a lot more sensitive, uncut men tend to reach orgasm a lot more quickly than those who are circumcised. And that meant that many public toilet encounters were all too brief. In busy spots & on busy days, I could make up for that with quantity, but it wasn't always that easy. So I became especially fond of men with a lot of extra foreskin, where working it back with my tongue would extend the whole encounter.
For some interesting (to me, nostalgic) photos of what I'm referring to, see:

http://www.acroposthion.com/

You will also be interested to see my find on double foreskin at:

http://asolitarypursuit.blogspot.ca/2015/12/double-foreskin-so-i-feel-sort-of.html

For commentary & photos on what it goes into best, see:

http://asolitarypursuit.blogspot.ca/2016/03/pussy-versus-cunt.html?zx=1a0cb5230dbc1273

To see lots of foreskin photos, see: http://yesforeskin.tumblr.com/archive