Transgender is by no means common, but it attracts alot of attention, so it's easy to rattle off the folks who fall into this category. It's particularly fascinating.

Congenital anomalies are also quite uncommon. There are probably fewer than 5 centers in the country who have experience dealing with gender correction for children.

Who knew your sex was a multiple choice proposition? Of course, it beckons the question of sensation. This probably belongs in Off-Topic.