Love is a drug - and it's not just singer Bryan Ferry who thinks so - scientists have found romance stimulates the brain in the same way drugs like cocaine or powerful painkillers do.
But what happens if you turn that premise ever so slightly, binding love and drugs - legal ones - to ask whether heart-pounding and pulse-racing desire can be chemical rather than chemistry?
That question goes to the heart of British playwright Lucy Prebble's The Effect, which has its New Zealand premiere this week as part of Q Theatre's 2017 Matchbox Season.
Set in the drugs' trail unit of a fictional pharmaceutical company, Connie (Jessie Lawrence) and Tristan (Daniel Watterson) are testing a potential new antidepressant. Sparks fly as soon as they meet and while Tristan's happy to accept the attraction is real, Connie questions whether it's a drug-induced reaction rather than romance. Meanwhile, their doctors (played by Will Wallace and Sheena Irving) observe with more than a little self-interest.
It's not the first time Prebble has put modern love under the microscope; her racy TV series Secret Diary of a Call Girl, starring Billie Piper, signalled she was a writer to watch. Piper, also known for her role as a Dr Who companion, played the lead in the UK production of The Effect, which won the Critic's Circle Best Play Award in London before transferring to Broadway.