9. Intelligent Bra

What it is: a bra that will only unlock in the presence of “true love.”
Not for Sale (yet) Average Price: Invented in 2014
This sophisticated smart bra will only release its hook for non-wearers when “true love” is involved. However, how? Because the Japanese undergarments from Ravijour include sensors inside that detect the wearer’s heart rate. Your Android or Apple iPhone app receives the data from the sensors when it is linked, and it uses this information to assess whether the heart rate suggests “true love.”