What is the only thing that can unlock a new Japanese-made undergarment?

A new bra from Japanese Ravijour is outfitted with a "true love sensor," and communicates with an smartphone app that handles the data analysis -- and the bra will only unclasp if the wearer feels love, according to the company. The bra is a promotional tool, and is not for sale, but the novelty coincides with an industry trend of wearable technology.