This postcard is a contribution for the online, literary magazine De Gids, who approached us with the question wether sex can be seen as a skill. The answer led us to design an abstract lesson on how learning to make love is similar to learning a new language. With ‘oeeee’s, ‘aaah’s and ‘mmm’s we composed a series of articulation excercises for the mouth, tongue and throat. We poetically named the project Diphthong (or Tweeklank in dutch).