My very good friend has the rare distinction of being a medical scrotum model. This was a paid position (behind white curtains etc) of being an anatomical model for the male scrotum for medical education purposes.

He read, and studied, many text books that described and illustrated the average, flaccid penis in order to mentally handle this job without emotional damage.

He was the first person to bring to my attention the argument over statue penis size vs. perceived real penis size and I'm surprised to see that the debate continues! He had many references to studies done in this field (it's surprisingly popular!)

Despite the continuing debate, my friend has a unique set of skills on his CV.