My boyfriend does commando sometimes and I couldn't care less. Unless him doing this is the sole reason as to why his hygiene begins to suffer (which is highly unlikely in the first place), it's none of my business whether he chooses to go free-balling or not.
Maybe, if she was really AMAZING!! I LIKE women in their underthings!! They look nice, and feel nice, and it's one more layer to 'unwrap' to get to the goodies!!! I like when I can see a pantyline on a lady, it makes me smile, that she is a 'good girl' maybe, and doesn't like that slutty 'anal floss' thong nonsense!! There are a few, at work, that change into yoga pants, and their work-out clothes, before leaving, and I love how the older ones just don't give a sht, if there is a pantyline showing through their yoga pants, because they want to be comfortable!!
I honestly don't see the point of underwear in the first place. I only wear them, because that's what you're supposed to do. People are saying unhygenic, but exactly how does underwear mean hygiene? It doesn't do anything. And everyone knows chicks going commando is hot.