I feel as though the technocultural process will eventually completely model and overtake the biochemical process. So by the death of biological sex I mean the actual death of sharing gametes, period. Humans at the moment are caught between two worlds - the biochemical world and the technocultural world. We have been cyborgs since our birth as a species. But if there is one undeniable trend - it has been towards creation of a world with more and more technoculture. In fact, it is the technoculture that we view as uniquely human. Everything that is biochemical is what we share with animals. At the end of this century I think sex will just be sharing brain patterns with an infinite combination of other minds. The path to this type of sex has already started (and is accelerating). Biological sex won't be dead in the Global Brain - but it will be dead a few decades into the Global Brain (IMO).