Some of these penises don't really belong in the "Extra small" category now do they.
No.3 looks to be average (although its a rather large head for a flaccid penis)
No.4 Admittedly it does look a bit like a baby dick, but its really not that out of proportion with his body, also it's about the same size as her thumb and she has pretty big hands for a girl. He is completlely flaccid too, it could get a lot bigger which is why i don't understand the look on her face, try touching it before you start judging him girl!
No.5 How is that extra small? Or even small? Thats a decent size for a penis that looks like it's just starting to get aroused. Also she probably thinks its cute rather than small because its "wrapped in skin" as they normally say for people who have a bit more skin than others in doujin.
No.6 the guys got some decent girth and what looks to be about average length for an erecet penis. I don't see any of those girls laughing, quite the opposite, they seem to like what they see.
No.7 is just a a complete chode lol (can't really defend that one, although he's got some decent girth aha)
Now don't get me wrong i'm into the whole small penis embarassment fetish, but if the penis actually falls in line with the averages or it does not look small compared to the body its attached to then you're just making what are potentially normal sized people feel bad about their dick. put a bit more effort into appropriate images gallery names like this in future please.