No one can help having erections, and technically women have them too. Siring a child is a heck of a lot easier than having one grow inside you for nine months and then giving birth to it. And all trans people live gender-normative lives before they realize what their problem is and decide to transition. The problem with Beatie is that she claimed she was a man, took steps to make it a reality, and then decided to take a giant leap back in the other direction while still claiming to be a man. If she had said she'd changed her mind about the being transgendered I wouldn't have an issue. (Everyone makes mistakes).

Also, MTF's are not equally comparable to FTM's. Let's face it, no matter whose criteria you go by, the female body is much more demanding of its owner than the male one. Because of that, an FTM being comfortable using their reproductive organs to their full capacity is not the same as an MTF doing so. MTFs and FTMs have different problems with their assigned gender and encounter different issues in transitioning.