To bring it back to Tantric Practices, etc.
Recently I have started reading a book by Julius Evola called, "Eros and the Mysteries of Love:the metaphysics of Sex"
The little I've read of this tome I really like....
Recommnded
For pure techniques to experiment with, I would look into Mantak Chia.
For original source I would look into the kalachacra from the Tibetans.
If one looks for the creative principle in
the universe, procreation and sex isn't that far of association.
Amazingly even some bateria already reproduce sexually.
However Mitiosis is a fact too.
The universe doesn't need sex to multiply it 's forms or to come in existence.
All in all I think that we glossed a bit of our own major form of sexuality
and physical construction into the universe itself.
However I think you will like this: Quantumtantra
You find it on this link under projects:
If nothing at least that guy has some original ideas.
http://www2.cruzio.com/~quanta/index.html