That's a lot of damn questions.  My two cents:  The hot ones are highly engineered, hormones, surgery, whatever it takes.  The process is pretty tough on them and many of them are emotionally unstable (hormones will do that for you).  None of them were born that way or "natural" as you put it.  They all used to be boys.  Many of them have feminine voices, many of them look better than "real" girls, many of them are hotter and better in bed than "real" girls and many of them sound like real girls in bed (some of it's acting, but I'll take it) and most of them are really horny and love to cum.  A few of them have much better personalities and are much cooler than "real" girls.  Any questions?  Now go out there and nail one for yourself and let us know how it went.

100% natural? How?  Not without the use of hormones.

I may not be the best to answer but I've seen several and although many are drop dead georgous they are out there and I would never want to see them again. All but one has had surgery as in implants and such. The one that is 100% natural (no surgery but on hormones) is a great girl to be with. I've seen her several times and although she not a super model you would never know her secret to interact with her. She likes to be treated as a woman as in she's a bottom and orgasms without any manipulation of penis and creams when being topped.