Briefs.
1) I have never been able to sleep in pyjamas, and boxers are the start of that.

2) Testicles usually 'hang' one a bit below the other. There is a good reason for that. Any guy who ever 'crushed' his jewels between his thighs will recognize that having them out of the way is a good idea. Crushing one's jewels between one's thighs gives a whole new meaning to the word "ouch". Briefs prevent that when one is asleep.

3) If I wore boxers, I'd figure I was wearing someone else's shorts, and that just wouldn't do.

4) For any of you guys who are going to say you wear boxers so that Mr Happy doesn't show when you walk around the house--I have heard that one before. My advice is to fold it in two or tie it in a knot. Duct tape works well.

5) Mr Loom (from the Fruit of company) has had me hooked on briefs since I was a kid.

6) I don't like the 'tangled' feeling I get from boxers. I toss and turn frequently when I sleep, and boxers make me feel like I'm being gift wrapped or something strange like that.

7) One can easily used permanent marker to put cute expression on one's rear end. I always go with LEFT RIGHT.

8) It is a kindness one can extend to people with whom one wishes to be rude. For example, I have told a few folks in my time to "Eat my shorts!" No one has yet taken me up on the offer, but there is less material on briefs, and in the unlikely event anyone decides to do it, I wouldn't want to be responsible for a choking death.

9) The elastic band will make a good fan belt to get one to the nearest gas station should an emergency arise.

Probably more than you wanted to know Mr Stan Field.

Bruce M