More of a question, but feel free to use it as the basis of a story.
Background: 2 key bits of info about time lords; they can travel through time and space. 2nd, When something occurs that would otherwise kill them, they regenerate into a new body. They retain their memory, but everything else changes, including personality to some extent.
So here's my question (or story suggestion). If a time lord regenerates into a female and then encounters an earlier (male) version of herself and they hook up...
Would that require an incest or masturbation tag?