For a cut guy, it is definitely an interesting feeling being wanked off by a foreskin. It definitely feels different thats for sure... :biggrin1:
For HIV, i have heard docking is VERY high risk. Think about it, you've got precum and if you cum while inside, that is going to be all over the place. The foreskin is a very thin membrane like the walls of the anus so the HIV virus can easily pass through it. Thats why they're saying now cut guys have less risk of HIV due to the delicate nature of the foreskin. I would only do it with partners that are 1 on 1.
Its not worth the risk.