You mean prolonged masturbation with a pseudohindu veneer to make it sound more exotic? Don't see the point but to each his own.
It takes having time to not be interrupted. Aromatic scents and oils. Intimacy with your partner and body contact always. You might penetrate or be penetrated but if so there isn't much fucking. Just penetration and holding in place. There's a lot of massage in a dimly lit area. Usually on the floor on mats. You can be on a bed but that is rather soft for tantric. I've had several sessions with a lover in a set up such as this. It's a very intimate time with each other. Not a lot of talk. Just touch, massage, and love. As the session unfolds a lot of emotions come out and you feel a closeness to your partner you don't normally feel. One final thought. Orgasm is not required. In fact it may not even happen but in the end you still feel good.