If they want to, personally I think my guy is sexy in them and will indulge me sometimes. If they find it works for them or if they want to be sexy in them like women do when they wear thongs, really, why not?
I guess I can say I've tried it but didn't care for it.If they made them so my junk didn't hang out all over than maybe Id try them again,but till than they ar just to small.
No one "should" do anything. Is it alright if men do? Of course. But it's not a matter of should or should not - it's a person's right and choice as to what underwear they wear.
It is not something I care to see. However, if men choose to wear them and I don't have to look at it, great! I wear a thong everyday. They are comfortable. I am sure some men find them comfortable too.