 Many fans see exchanges between the Doctor and the Master (played in the new series by John Simm, whose "Life On Mars" character Sam Tyler is also the subject of a lot of slash fiction) as indicative of a previous relationship, or current attraction.At one point the Master says to the Doctor "I like it when you use my name", and in a Children in Need special, the tenth Doctor tells the fifth, after being asked whether the Master still has "that rubbish beard", "no, no beard this time.Well, a wife. "