Serious question - What type of underwear do you wear?

Not being homo or pervert... I am wondering what type of underwears ya'll wear.
The reason why I ask this is because testes temperature regulates secretion of FSH, which helps with maturation of semen.
I used to wear a roomy boxer, but switched to boxer briefs that were much tighter. It definitely makes my testes warmer.
What type of underwears do you wear? Boxer, boxer brief, brief, or anything else? What materials are they made of? I would appreciate your response!

In a forum where all people do is demand picture proof I can see this thread getting out of hand

Boxer briefs. I feel some support is needed vs none at all with boxers. I believe mine are mostly just cotton. I wear Calvin Klein boxer briefs and Kenneth Cole Reaction.

What is this thing you call underwear. Actually I dont wear any underwear at all except when I'm at work. Walking around without them is actually quite liberating.