Ravijou, a Japanese lingerie brand, brings us the True Love Tester. According to the product description, it's “the world's first bra which can only be unhooked by true love!”

The lingerie company developed the bra as part of a campaign to celebrate its 10th anniversary. Featuring embedded sensors and a high-tech clasp, the True Love Tester bra connects to a smartphone app via Bluetooth. Sensors monitor heart rate and the app analyzes the received data to figure out if the woman is in the grip of true love.

The designers point out that the type of excitement a woman feels when she's in love is distinguishable from other types of excitement, sparing the wearer from her bra dropping off at the sight of her favorite snack.