Sex, reproduction, and marriage have been linked for most of human history, but today that paradigm is evolving. This season of Anatomy of Next we've looked at every aspect of turning Mars into a habitable world. Now what about the changes in biology that are going to alter the way we populate our world? From artificial gametes derived from skin cells and genetically-modified embryos to babies in bags, polyamory, and the heteroflexible astronaut – let's talk about sex.