Use every man after his desert, and who should 'scape whipping?

Every once in a while I see a survey result that really surprises me.  I ran across this one recently, from a survey conducted by ICR in 1997.  "Do you think adultery should be punished as a crime, or not?" 20% said it should, and 6% weren't sure.

Another survey conducted about the same time by Gallup asked "what proportion of married men in this country do you think have ever committed adultery?  Most married men, more than half, about half, less than half, or very few married men?"  48% said most or more than half [I know that most means more than half, but those are the options they gave]; 31% said about half; and only 18% said less than half or very few.  People were asked the same question about women, and 26% said most or more than half, 34% said about half, and 37% said less than half or very few.

[data from iPOLL, Roper Center for Public Opinion Research]