That's what the results of a survey by SnogLondon (I'm not making this up) suggest, anyway. The dating organisation interviewed 5,000 single tube users to get a sense of the system's pick-up hotspots. If you're heterosexual girl, go for the East London line; if you're a heterosexual boy, take the Bakerloo line. Unfortunately, the survey doesn't go into more pansexual detail, but hey it's a start. Full results, here.