there is like...a surprisingly small amount that most contemporary srs surgeons don't use. there is some all the parts of the buffalo stuff going on there. most of the medical waste is one of a few things: excess skin, corpora cavernosa, corpora spongiosa, and the testes themselves. significant among spared tissue is the ENTIRE neurovascular bundle of the pudendal nerve, wherein the dorsal nerve of the penis earns a new lease on life as the principal innervation of the clitoris. the total number of nerve endings is pared down, to be fair, as some of the endings perish along with the excess skin. what this does mean is that a typical post-operative trans woman has fewer nerve endings on her clit than a cis dude has on his penis (checking in at about 3500 on average), and a good deal fewer than cis women (with 8000), but the human body is pretty intensely capable of working with what it's got! it's true that trans women frequently have difficulty with orgasm, but that's not an uncommon affliction among women. some of it, obviously, can be chalked up to the fact that playing legos with delicate sensory nerves can do some damage, but some also has to do with a lack of accurate information about what makes women (cis or trans) feel good. the point is that the miracle of science can do some pretty amazing stuff to your junk and i'm a fan of it.