Sex became conflated with kundalini, but in reality sex and kundalini have nothing to do with each other.
Even the Tibetans don’t get it honestly. But they are not at fault. They are a victim of translational history from India to Tibet.
What happened was there were indeed sexual practices, but these had more to do with realizing everything is pure in the universe.
Kundalini was separate, but became conflated with the above.
So in summary:
Sex is a part of tantra.
Kundlani is a part of tantra.
But sex is not a part of kundalini.
Hi Alwayson:
Whether there is a relationship between sex and kundalini or not is not a philosophical point. It is an experiential one.
For those who experience kundalini as an expansion of sexual function, that is what it is. And for those who do not, it isn’t.
Either way is fine. Practice, and it will be what it will be. There is no point in debating what someone else’s experience ought to be, or how they ought to interpret it. Better to practice, and encourage others to do the same. Then it will all come out in the wash.
The best knowledge is found in direct experience, not from anywhere else. All the great scriptures of the ages are a second-hand shadow of the eternal light shining in every one of us here and now.
The guru is in you.
What!!! 
My understanding of Kundalini is the same as this FAQ
http://www.aypsite.org/forum/topic.asp?TOPIC_ID=2169#2169
I am talking from experience as well. The genital center does not directly map onto the sushumna. Anyone can feel this for themselves.
There definitely is sex in tantra. But it is separate meaning and purpose than kundalini.
All I know from my experience is that during…eh, tantric practices 
I am able to use my attention to direct the sexual energy I’m experiencing right into the sushumna and right up to the third eye…huge kundalini stimulator for me…
I don’t know what to call it…other than awesome 
Forgive for interjecting, but my experience is that kundalini is just attention. As sex it is attached to the sex organ. When the attention is released (by dropping the “I”), it just spontaneously rises into the heart (primarily), neck and the head (and above it), responding to attention of non-duality with everything else. Then “kunda” is spread out all over.
From my experience, I will have to disagree with that Osel.
huh?
Expand on this.
Kundalini energy is the same as sexual energy, which is the same as what produces humans, animals, flowers, life.
The reason it is confusing is because it manifests differently in different places. When it is in the sexual organs and lower chakras we feel it as sexual. But when we feel it in other parts of the body, it still can feel orgasmic, but we don’t usually call it sex.
Martial artists use that same energy for fighting, healers use it for healing, and there are other uses. You can call it a different name everytime it moves if you want. Just like Eskimos have a hundred words for snow.
Thanks for the laugh, Parallax 
I agree, although I tend to not call it anything
nice one Parallax , oh and for alwayson and konshok can you explain natural vajroli when it happens after ejaculation or why whenever i am into brahmasharia there seems to be more ecstatic energy present and why do i have an erection even during a practice like deep meditation…
Energy is always in movement – either going out or coming in. Energy can never be static. These are the laws. When an impulse, any impulse, comes to you, it means energy is moving out. When you stop suddenly, the energy cannot be static in you. You have become static, but the energy cannot be static in you, and the mechanism through which it was moving out is not dead, it has stopped.
So what can the energy do? The energy cannot do anything other than move inward.
The Book of Secrets - Osho <http://rapidshare.com/files/8233179/Osho-The_Book_Of_Secrets.pdf>
Energy is always in movement – either going out or coming in. Energy can never be static. These are the laws. When an impulse, any impulse, comes to you, it means energy is moving out. When you stop suddenly, the energy cannot be static in you. You have become static, but the energy cannot be static in you, and the mechanism through which it was moving out is not dead, it has stopped.
So what can the energy do? The energy cannot do anything other than move inward.
The Book of Secrets - Osho <http://rapidshare.com/files/8233179/Osho-The_Book_Of_Secrets.pdf>
The power of potential... not moving... emptiness... deepest penetration of insight...
manig, research some of the controversies of Osho.
Thats the nature of the energy body, including the genital center. But it has nothing to do with sex or the genital center singularly.
I am talking from experience as well. The genital center does not directly map onto the sushumna. Anyone can feel this for themselves.
There definitely is sex in tantra. But it is separate meaning and purpose than kundalini.
i'm a bit :blush: in confessing this but hey it's just neuro spirituality; So let's just say that it happened with me during tantra practice and spinal breathing. but there was an erection and i could follow the white tube and feel it from the head of Ananda Junior :grin: back to the perineum than up to the sushumna... with love :kissing_heart: Ananda
Ananda exactly!!
The gential center connects with the perineum, not the sushumna directly
Hi Ananda, alwayson and all
Yes…
I still remember…years back…when the Kundalini rose up the Shushumna for the first time. I was sitting at my kitchen table…after months of spontaneous many-times-a-day-orgasms (no junior involved LOL)…There was some kind of…vacuum…suction…in the perineum…everything went completely still for a while…and then the energy that had already travelled other routes for a long time…all of a sudden travelled up the central channel…
So…although there is not a “linear map” to follow…there is certainly an experiencial route…and I never needed a map for that. It matters not what I call it.
Here…there is absolutely no difference between sexual energy and Kundalini…it is all the same energy…only it is transformed and perceived differently through the chakras…just like electricity is perceived differently according to where it is released. Also…the same energy keeps transforming itself and becomes more and more refined…it is seldom located below the heart anymore…only if I will it …and I stopped that quite a while ago…the love in the heart is more than enough… 
Ananda…thanks for your openness 
life is too short my friend to waste researching controversies
btw, this has been the most controversial book of osho:
http://balbro.com/s2s/
you can get your answer in the first chapter