I think that this is really the case in point. I know there are far outliers on either side of the equation, but most guys are going to be in the 6-7" category when erect. On the other hand any size can be great if used well (based on research, I'm a guy so I don't have much practical experience with the subject other than my own), so it really depends on how big or small the woman is comfortable with. I will say that the longer it is the easier it is to do certain positions vs others. Someone with less than 4" isn't going to find doggy style all that fun, but might love missionary, meanwhile someone with a 10" member might find missionary a bit cumbersome, yet love doggy.MetalMagpie said:It's an interesting question. All of the guys I've been with have been about the same size when "active" (they've also all been white, before someone asks) so I can only really speculate.
OT: Breasts being too big is largely dependant on the body of the woman. I say the only sure method of figuring out that they are too large is if the woman's back is starting to hurt from the weight.