1) How come genetic girls have that distinctive walk? Is it become of some physical thing, like the bones are positioned differently? Is it just noticeable because there is more fat around the hips? It is all mental?Just for a bit of clarity... I'm just pretty much expanding on what's been said.
The way girls walk is a product of the angle the femur enters the pelvic bone and balance. The hip bone of natal women, if you're looking at a pelvic cutaway from above looking down, angles (forgive me, I'm going off of memory here) pointing towards the anterior (front of the body) and inward (knees more acutely angled towards the centerline of the body). Or at least something to that affect. As a result, the legs swing "fore and aft" as they rotate around the knees, whereas men's legs swing parallel.
Women -- ( )
Men -- l l
Also, The wider a woman's hips the more her hips sway as a result of keeping equilibrium. Imagine a slender woman, both legs angled slightly inward and equal weight on both legs. Imagine removing one leg. The pelvis shifts toward the missing leg to keep weight centered on the body to balance on one leg. Now, imagine the same women with both legs, but offset her hips further from center line appearing as if she has much wider hips. Remove the same leg and the pelvis will shift further towards the centerline to maintain balance (wider sway).
2) How does voice feminization work? Even if you do the training, isn't it going to return to normal unless you make an effort every time you speak?In a sense, yes. It becomes second nature to speak once properly trained but you are pushing your voice to it's uppermost physical limit. I always joke, when people ask me to sing now (I used to pre-transition), my voice only goes in one direction, and that's down.
3) Does you body hair "know" how long it is? I mean if not, how come leg hair doesn't grow as long as the hair on your head?It doesn't "know" how long it is but the body is a tremendously complicated instrument. First, the body has different hair follicles than on the head. The body also gets subtly more cold when it has less hair (also factor in genetics). This can be illustrated when you shave your legs then immediately get goosebumps and you get the little pokeys. When you shave your legs, you're more susceptible to goosebumps. The pricklies is the result of the goodbumps urging those follicles to grow some hair. After a certain length, genetics and these senses factor in to tell your body that your body hair can growth can slow down a tad but it never stops completely, even when it's been dormant for a period of time. Does anyone have an old uncle or grandpa who's eyebrows are sasquatshingly long?! LoL