This reminds me of an apocryphal bike story that made the rounds back in the 70's, back in the days of Italian wool shorts:

There was this young bike rider, a guy in his early 20's, very dedicated to the sport. He trained real hard, ate all the right stuff, got plenty of rest, did quite well in the local races. The only problem was, he always had this excruciating pain in his scrotum whenever he rode. It got so bad that he had to make a choice: have an operation to remove his balls, or quit cycling. Well, he was so dedicated that he decided to have the surgery. Shortly after he had recovered from the surgery and he was back on his bike, feeling much better, his club hosted a session by a top Italian cycling coach. The coach came and checked the position of all the riders. He watched this young guy ride, then he told him:
"Use stem 5mm shorter."
"OK"
Frame size is 58?"
"Yes"
"OK, good. Saddle is at 79 cm from bottom bracket, with 8.5mm of setback?"
"Yes, that's where I've got it."
"Good. You wear Vittore Gianni size 4 shorts?"
"No, I wear size 3."
"No, you wear size 4. I have rider just like you back in Italy. Same size, same build. Wore size 3 shorts. Had excrutiating pain down there. Switched to size 4, and pain disappeared."

Luis