I care more about what I'm wearing. But it's nice if the guy is wearing nice underwear. Just seeing the CK/Diesel/Andrew Christian waistband resting along the waist line above the jeans he's wearing...
No, that's like caring about what kind of cellphone he uses or what kind or car he drives.
!!!
Its just clothes and it isn't like you will be seeing them in public.
People make me laugh when they show off their undies since only they know what it looks like until the bedroom.