Got Chemistry?

"I’m not going to get into Einstein’s theories on relativity, but suffice to say, unless my sweetheart and I reach catastrophic levels of corpulence – or maybe get hit by a really high dose of Marvel gamma rays – gravity’s not going to be the thing drawing us together. How about a chemical bond? Oh, yes, I went there. 'An instinctual, apparently unanalysable, attraction or affinity.' That kind of chemistry."