Couple and heart bio-feedback

A long time ago, back when I was a teenager I saw an advertisement for a device that could be a kind of bio-feedback, to improve the feeling couple advertised. In the ad you saw a man and a woman (naked) sitting across from one another with two electrodes placed on the chest and connected to a device that would send sound to the headphones they were wearing. Each person felt the beat of the other person. I think this thing is exciting and beautiful. Has anyone ever seen this ad? You what do you think? Thank you already for your opinions.

I have never seen the add but it would be a wonderful thing to try. I enjoy doing bio feedback with myself. I can only imagine what it would be with a partner completely naked!