I love watching the underside of cocks pulsating cum out. I love feeling the pulsations with my hand or mouth when it cums. So I was searching for pulsating videos and found a great forum on reddit, in a forum named cockpulse. Check out the top links of all time from that forum, yum. Direct link: only registered users can see external links . my favorite so far is this one, pretty amazing: only registered users can see external links

I was hoping there would be a throbbing/pulsating emoticon I could add here, but the site doesn't have one yet.