I think I posted almost the same question once. I am currently at 7.75BP, and my girlfriend has to be pretty aroused for me to pound hard in alot of positions, if she is only kind of aroused, or I don’t take time to warm her up, it can even hurt in almost any position. That seems to be the consensus for the average guy around this size. On the other hand, she absolutely loves it deep when she’s real aroused. My guess is that 8 BPEL is a good final goal to try and cement. I plan to go to about 8.25-8.3 so I can cement 8, and I don’t know that I will ever want more, I think if your goal is to give a women great sex, and not just to have the biggest penis she’s ever had (which you still are likely to do) this is a goal that sort of splits that line.