I wore the Munsingwear Kangaroo Pouch boxer briefs when they first came out, then the Jockey Horizontal fly boxer briefs.
A few years ago, I saw a short film on the internet about Tommy John "adjustment free" underwear. It is the kind of thing you find here in the "Make Us Laugh" thread. It showed a series of everyday, ordinary men trying to adjust themselves in public without sticking their hands down their pants. The gyrations were hilarious. Then they switch to a fitness model doing yoga/dance moves wearing Tommy John boxer briefs and guarantee that they'd never bunch, sag, ride up or form a wedgie. Well, I just had to go to the website to check them out. I was shocked at how expensive they are and decided to stick with the Jockeys (you can get 4 Jockey boxer briefs for what 1 costs at Tommy John), even though they tended to sag sometimes.
Perhaps the "freeballers" in this discussion have never had this experience, but a few days later I suffered excruciating pain after accidentally sitting on my "danglie bits" (which tend to get danglier as you age 😉) as I climbed up into the driver's seat of my truck. At that point, I decided I could do with a little more support than I was getting from the Jockey's, bit the bullet and tried out a pair of Tommy Johns. I was hooked and decided they were worth every penny. Now every year on the Black Friday sales I stock up on their second skin boxer briefs. And yes they have a horizontal fly, but it's too close to the waistband to be useful.
Here's a link to the closest to the original ad I can find: https://youtu.be/o7vUqAvJ-S0 It's good for a laugh!
I'm not trying to sell a product...just passing along what I think is an amusing anecdote.