text: There are a couple of credible The four-letter word for vagina remains off-limits in polite conversation ( although that has more to do with feminism than with profanity ) , and the slang expression for those who engage in oral sex with males is not yet acceptable by the standards of office-meeting etiquette .
  
  ###
  
  There 's a couple of credible , the four letter word for vagina is off limits in polite conversation , and the slang expression for those who engage in oral sex is not acceptable in the office .