I had to read a bit about Dom/me Space before I could compare. (Still new at this.)

Getting into a Tantric state sounds very similar in that they are both a kind of hyper-focus. Nothing else exists except that moment, no past or future, only present.

However, there is no S&M. Tantric practices are a very sedate, soft approach to lovemaking. Tantric teaches to "honor" the genitilia by caresses and soft movements. No rough housing.

Now you see why I'm here!?