there is a lot of risk of implant or stem cell vagina, never really heard of stem cell ones but rejection is very possible due to dna, blood type and genetics. like someone said earlier males have xy cromosomes, females have xx, with that you have many risks, cancer is probably would be the biggest since if stem cell or implantation did occur, the dna would cause abnormal cells which is what cancer is. there are tons of risks involved with it, and myself wouldn't undergo that, as long as I have a vagina just from sex reassignment then im ok with it. it shouldn't matter if its cosmetic or real as a matter of a fact usually u get all the sensation of a real one after the surgery so all in all it doesn't really matter. stem cell research is still in its early stages and I wouldn't risk it for anything.