I have around 300 jockstraps and over 100 cups
Started wearing jocks at 10, collecting around 12, cups came later when I was around 21 up untill now at 67
With 30-40 guys changing and showering at the same time you got to see and compare a lot.. Occasionally someone got hard and got teased. I often got hard changing for class, but just stuffed my cock under the waistband of my jock till class started.
I started wearing a jock in 5th grade. I was one of just a few that wore one, most guys just put their gym shorts on over their briefs. 7th grade jockstraps and showers were require. So I got to see everyone strip to put their jocks on, and at the end of class walk nekkid to the showers.