From the site "My full name is Micah Elizabeth Scott, but I used to be Micah Dowty prior to Fall 2010. My friends call me Beth."
How can a woman who used to be a man can have a vagina? is there some kind of surgery? do you keep your sensitivity to be able to use vibrators?
The short version: They form a vagina in the pelvis and reuse the head of the penis to form a clitoris. The urethra is also rerouted.
Caveat: I am nothing more than a layperson on the subject. My short version may be wrong, and there may be other surgeries available.
The longer version: Wikipedia  has quite a bit of information on the subject. Use incognito mode if you must; I've always found it to be a fascinating subject.
: http://en.wikipedia.org/wiki/Sex_reassignment_surgery (No images if you're worried about that.)
If we were talking about someone with a surgically reconstructed vagina I think that would be relevant in this particular story, just because physically it won't be identical and the effect of the vibrator could be different.
(Just a few self-photos from Beth's public Flickr stream; all pics are work-safe. This is an extremely cool hacking article, btw, regardless of the author's gender history.)
A sex change is hardly the only explanation, but it's a very likely one. Be honest. Let's say my name is John Leslie Roberts and for my entire life up until 2010 I was referred to as John, then I told you to start calling me Leslie from now on. I seriously doubt you would just shrug that off.
If you're wondering how others drew the correct conclusion without additional information, this is how. It's extremely common for those who have had male to female sex change to choose a female root name buried within their current name or names. It's extremely uncommon to do that for any other reason. People associate names, gender and personal identity very closely.
You change one so drastically, there is a good chance you've changed the others too. There is a lot more to that sentence than just a name change.
If it was a marriage that caused the name change, she would have just said that point-blank. No need to dance around it. From the lack of explanation it was pretty clear that it was a sex change.
Sometimes names can be different genders in different countries. I'm in Ireland, and here Rory is a male name, but apparently in USA it's a female name. The world is big and weird.
(And yes, modern surgery can create vaginas)
Yes it's call vaginoplasty http://en.wikipedia.org/wiki/Vaginoplasty . There's also one for penises, phalloplasty http://en.wikipedia.org/wiki/Phalloplasty
do you keep your sensitivity to be able to use vibrators?
Some trans people who get genital (or "bottom") surgery report increased sensitivity, compared to before. Modern surgery is getting better all the time.