Betty Draper: You don’t kiss boys, boys kiss you. The first kiss is very special.
Sally Draper: But I already did it. It’s over.
Betty: You’re going to have a lot of first kisses. You’re going to want it to be special, so you’ll remember. It’s where you go from being a stranger to knowing someone. And every kiss with them after that is a shadow of that kiss.

Mad Men, Season 3, Episode 8: "Souvenir"