Im talking about the spiritual side of sex...thats why I said it isn't proven to easily, but those who know, know it does exist i.e. becomeing one with your partner total resonance with their EMF/auric field, the emotions that they feel intertwined with your own can't be emulateted, because that is a response that is evoked from free will...if a robot is programmed they don't have free will and you cant fool an individual that has experienced even the slightest karma sutra sensations...it can occur even with just a hug.
I feel that souls emanate from the "Magic window" frequency band, (yes its an official term in neuro-electrical consciousness studies)
this band exists beyond matter/energy as we know it, above gamma and epsilon waves.