I never do, i'm usually in my underwear more than anything else anyway. i.e. Get home from work and walk around in underwear and a top, much more comfortable.
I go commando more often than not. Usually, the only time I don't do it is when aunt flo is visiting or when I'm going shopping. Other than that, commando it is.
My wife went commando once as a sexual thing for me and ended up liking it now she does not own any underwear all the time. It also reduces the chance of infections
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