Anyway, Koop's quote and the alan guttmacher quote in context would be talking about the spread of STDs. This chart doesn't make that clear. Koop wrote the US Policy on AIDS during the 80's, when he was the Surgeon General under Reagan and Bush 1. The US administration's policy at the time was to teach kids abstinence, however, Koop pushed for teaching kids how to properly apply condoms to help retard the spread of disease.

shaking hands huh? and how often do you simply do nothing when someone extends their hand to you for a handshake? or is it that you get out into the world so rarely that you don't have to worry about shaking hands?