According to one source, "Micro penis refers to a penis that, when erect is less than 6cm(2.6”
, and less than 7cm(2.76”
in girth." Other sources say simply that a micropenis is any penis that is "unusually small." About one in 200 men have micropenis. So far this discussion has focused on length as the criterion, but girth is obviously just as important, if not more important.
I consder my penis to be "unusually small," since 9 out of 10 men are significantly thicker, and the average girth is a full inch thicker than mine. If most women "cannot feel my cock" with a 4 inch girth, anything less than that (2.76 inches) ceases to be an issue.
It's interesting that, according to the definition qioted by NJQT466, micropenis only applies to men without hypospadias, because of the genital ambiguity hypospadias implies. Since I have hypospadias, the term micropenis is inapplicable, regardless of my size. In other words, since nature had a tough time deciding whether to make me a boy or a girl, I should be expected to have a small penis.
When NJQT says that sex with a small penis was "not a fun night," she is simply saying that she values the intensity of sexual intercourse, and a small penis doesn't provide it. She has every right to be disappointed in nthe context of her wants and needs, and should not be criticized for that. She isn't saying she would never consider giving that up for something else (i.e., love) that was more important.