This study was a follow-up to one in which Dr Maestripieri had tested the existing theory of who makes a good dad, and found it wanting. This is that the more testosterone a man has, the less likely he is to hang around to help bring up baby. Using a questionnaire which asked things like, “How much do you like babies?”, “Do you think most babies are cute?” and “Do you want to have children someday?” Dr Maestripieri showed that the answers are uncorrelated with a man’s testosterone level, as measured from a saliva sample. Good news, then, for women who would like to settle down with a hunk, but fear hunks are not the settling-down sort. But there is still the question of which hunk to choose—and that is where the movie (an attractive young lady performing a striptease, and then masturbating) comes in.