Recently I have been enjoying Tantric connections with two couples (not at the same time). I find the energy of relating to a couple fascinating.
The major energy channels in the body, according to yoga and Tantra, look like the medical symbol, the staff with the two snakes spiraling around it. Wouldn't the AMA be horrified if they knew? There is a central channel that runs from the root chakra at the perineum, up to the crown chakra at the top of the head. They are encircled by two smaller channels, one which carries the yang energy, the other the yin.
I've been experimenting with creating this configuration with our bodies. As I sit or lie between the couple, letting them be the two spiral energies, I become the central vertical uprising of kundalini. It's an ecstatic experience!