From the article “Boxers Versus Briefs” on MSN Lifestyle:
http://men.msn.com/article.aspx?cp-documentid=5364805>1=10416
…because the “Hi, how ya doin’? So whatchya got on under there?” line of casual questioning will likely lead to a slow backing away followed by an uncomfortable stare and the closing of doors and drapes when you later step outside.