Kissing. Usually it was a very big deal. Not a peck on the cheek or a slight kiss on the forehead. Those were kisses you could receive everyday and from anyone. A kiss on the lips was different. It was special and usually it held some kind of meaning behind it. From simply attraction with the purpose of carnal pleasure to pure love, a kiss was a sign of emotion.
Mark viewed kisses very highly, he enjoyed them and he liked to believe he was good at them. The problem was he wasn't very good at rejevitng people. Just like his friend he was a pushover, plainly unable to read a situation when it came down to things like that.