OK, first I searched the forum and couldn't find an answer so here goes. I have never bought a pair of bike shorts but knew I needed to after getting an (eeww) infected hair after riding wearing my cargo shorts. I went to my LBS and tried on about 3 pairs of shorts and wound up buying the Sugoi Evolution shorts. They were comfortable and I didn't feel like I had a diaper on. When I went to pay for them, the guy behind the counter asked if I tried them on with my underwear on. I looked at him like he was a total idiot and said of course I did. He went on to explain that you should wear biking shorts without underwear. So this leads to my question - Is that correct?

I told my best friend about it, she rides all the time, and just did a 75 mile ride and said she always wears underwear.

What's the verdict?