Surprisingly sex is one thing that does not really feature in Walt's life. Jesse has sex and so does Skyler but with the exception of when he suddenly rediscovers his libido early on, Walt really doesn't get any. Mr White doesn't seem all that bothered, presumably he's too busy with his life of crime to notice but there is that one moment in season 3, after he learns of Skyler's affair with sleazy boss Ted, where he tries to come on to the assistant principal of the high school where he works. In typical Walter White (not Heisenberg) fashion he makes a complete pigs ear of his attempt to be lusty and finds himself on the end of an indefinite suspension. But still, top marks for trying Walt.
