I don't think the OP's well endowed friend exists. I think she started this thread to find guys with potentially massive shlongs and/or a lot of confidence.
Nah, I think she's looking for who to rule out. There are occasions to find girls who like big ones, but mostly they just say it hurts more.
Besides, what everyone here is forgetting is that op is Chinese, so by "friend" she probably means "朋友", which translates more properly as "boyfriend" or "fiance", just like when some Chinese say "sister" they often actually means "姐姐" which is better translated as "cousin" or even "girl I just saw on the street who has no relation to me."