I think most american guys don't ever see a uncut cock and they are very interested in how the foreskin slides over the head and how easily it pulls back. I have been stroked for long periods of time while they just watch. Oral sex is the same way. Seems they like to see what they can do with their tounges while sucking cock. And back pre aids days I knew a couple that liked getting their cut cockheads docked by mine.