He tests their testosterone levels by cupping their balls, and feeling their weight. RFK Jr. taught them how to do it, he's been doing it for years. They had a late night session in the Oval Office, where they all practiced it on each other. Stephen "PeeWee Himmler" Miller had the smallest balls, tiny really, and he cried when they all made fun of his mini pee pee. Good times, good times...