So what is the connection between transexuality and trans-humanism? It would be helpful to clarify this. Certainly transexuals are a sub-group which has grown remarkably since the 1960s.
Non-reproductive sexuality is a major part of the trans-humanist project. Theoretically plausible, and quite possibly deployed, is the creation of trans-sexuality through bio-social engineering. Bio-chemical, genetic, electromagnetic, subliminal, trauma based, esoteric, social and educational engineering.