Also, regarding phantom erections, phantom orgasms, etc.: this has also just made me connect the dots between two other things I read.

One was an account of a pre-op MtF describing what an orgasm feels like, and saying that it matched descriptions she heard from women more than descriptions of male orgasms.

The other was testimony by women who had nerve damage or were paraplegics, and whose erogenous zones transferred themselves to other parts of their bodies, resulting in orgasm from stimulation of some body part that you'd think you wouldn't need for sex.