You know, some people have been hurt in love. It's OK. Maybe those people will consider $1,750 (around about AU$2,250 or £1,220) a small price to pay for peace of mind.
That's how much Spanish company Durmet is asking for the Smarttress, a smart mattress with a built-in "Lover Detection System" (yes, that's what it's called) that will send an alert to your smartphone "whenever someone is using your bed in a questionable way." It uses 24 sensors to detect whenever the mattress starts a-bouncing, then pings the user's Android or iPhone.
It's still in production, but to prove to re/code that the mattress is real, the company sent through this video of the testing process. Of course, if you are really that concerned, a nanny-cam will cost you a little less money...although it's worth pointing out that a smart cheater probably won't conduct their extracurricular activities at home.