Chancellor George Osborne has one, so does Education Secretary Michael Gove.
High-tech wristbands are the new craze for tracking a healthy lifestyle, monitoring sleep patterns, heart rate, what food you eat – and even your love life.
With just one glance at the data, your partner, would be able to tell if you had sex recently and how intense it was.
It will also mean the end of faking orgasms since the tracker records everything minute by minute on a data base including the number of calories burned.
The portable personal trainer tracks a person’s health habits, syncing with an app on a user’s mobile phone to offer advice about how to be healthier.
Mr Osborne’s tracker, a £100 Jawbone UP, has a motion sensor inside which stores steps, calories burned, distance, and active versus inactive time.
The motion sensor even tracks the user while they sleep – tracking their movement to gauge when they fall asleep, how long it takes, and how much deep sleep they’re getting.
If that wasn’t enough, the iPhone app prompts the user to take photographs of every meal, and tracks where, when and what they have eaten.
Mr Osborne’s black version was first spotted as he gave evidence to the Treasury select committee two days ago.
He uses it to monitor his sleep patterns and track his fitness regime, including when he is out running.
In America some trackers are designed to be worn all the time, even in the shower . In fact, the next evolution of health trackers are patches, which never need to be recharged or removed.
The models show the difference in calories burned during sex and lifting weights or running in the gym.
Blogger Gregory Ferenstein writes of the joys of his Bodymedia armband on techcrunch.com
He says: ‘There’s all sorts of fun statistics couples could do to quantify their love-making.
‘You could track the average duration of sex over a decade, the number of afternoon delights in a month, or the quality of one’s sleep with and without a partner to spoon.
‘For techno-optimists it will reduce cheating and prompt honest conversations about satisfaction.’