My six vote, counts for each of the two times I've circle jerked. The first time was in the park when I walked up on five guys with their dicks in their hands, so I joined in. I noticed all eyes were on the biggest cock as we stroked (no, not mine). As each guy shot he put up and left the group. There were lots of various sizes, all the way from nine+ to under six.
The second time with 6 of us was in the sauna of the YMCA when a married dude began to play with his dick in his shorts before pulling it out hard and giving himself a serious masturation. One by one four of us pulled out and joined in, again with all eyes focused on the biggest dick. Five were masturbating at once, but one dude, also, with a wedding ring on just watched as his dick stood straight up against his belly. The dude had self control, but I knew as he walked out with a swing erection, he had pussy in mind.
This is a hot thread and I'm looking forward to reading other circle jerk experiences you guys have had.