Don't have small penises: they have average sized penises.
Most of my mates don't have a problem and they enjoy it but I'm really sensitive and it becomes painful.
And the fertility of plants, beasts and people was ever an issue, since it could not be taken for granted or brought under human control by material means.
When it comes to the appearance of our own sexual parts, the old adage "beauty is in the eye of the beholder" appears to often be false.
In studies where people measure themselves and self-report, we usually see larger averages than we do when doctors or nurses are doing the measuring and reporting.
I lived with my grandma at the time, and I couldn't get the tear to stop bleeding.