Biologically, there is an erotic element to death for a few people.But this is not real life. If you've sat by a bedside comforting a grieving spouse when their loved one passes (or has past) away you know death us not a joyful, romantic experience except in the imagination of poets.
I agree with Woodduck. Today new mix is going to be Love Potion No. 9. Except that Isolde is now played by the great Sandra Bullock.Oh come on, show a little historical awareness. This is the middle ages. People believed in such things. It would have been some herbal mixture, and it hardly matters what was in it. Tristan and Isolde thought they were taking poison. They expected to die, the ship had docked, King Marke was due to greet them and claim his bride, the pressure to get it over with and end their hopeless situation was intense. And then - OMG! - they didn't die. So there they stood, having in effect confessed the love they'd been holding in all this time, expecting to die together, and finding themselves gazing into each other's eyes. So what could they do?
Love potion? No, just time to admit the truth. Psychologically, that's pretty damned real.
Perhaps although there have been some chemists who have attempted to make a chemical love potion.As I said, it doesn't happen outside the movies!