Very interesting post, I would really like to see original research paper references about creating embryos and sperm from skin cells, because if true, it's a significant scientific discovery! If we hypothesize that in the future two men/two women will be able to have an offspring, I would just like to point this biological fact out - since men produce spermatozoids that carry X as well as those who are Y chromosome carriers, two men could have both boy and girl; however, women produce only X chromosome eggs, which means that two women could only have daughters :)