First-off, I'm a guy too. That being said, this has been done to death. I'll go ahead and tell ya what most of the girls are gonna say:

#1 There is a point where too small is too small--like 3-4 inches and the size of a cigar in diameter.
#2 If its fat (like a stick of pepperoni), then it can be a lil shorter than about 6 inches and still feel ok.
#3 The best for most women is a combination of the two==6-8 inches and the diameter of a golf ball or a lil bigger.

What did I get wrong ladies?