Of course you can Google Vamacara Tantra but insofar as experience in attaining a samadhi via sexual ecstasy- that is for all practical purposes a separate issue. I had such an experience that was totally spontaneous and at a time when I was totally naive about any mystical or metaphysical lore of any kind, much less Tantra concepts.
I describe my efforts over the past 35 years to integrate the experience intellectually and spiritually in my website at
http://geocities.com/maya-gaia/mysticalexp.htmlI offer some insight for a neo-tantric approach and some caution about trying Kundalini yoga plus allot of other paranormal
experiences I had both related and unrelated to my transcendent episode.