It was only a matter of time before someone came up with a 'FitBit for your penis'.

A group in California claims to have done just that with a 'smart' sex toy that tracks everything from calories burned during sex to the number of thrusts and even your top speed..

Named Lovely, the sex toy links up with your smartphone and uses your data to recommend 120 different sex positions and ways to improve your technique.

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A group in California has created a 'smart' sex toy that tracks everything from calories burned during sex to the number of thrusts and intensity of intercourse.

The one-size-fits-all toy also vibrates to help provide stimulation during sex.

It connects to your smartphone using Bluetooth, and has a battery that lasts around seven hours when it's not vibrating, or two hours when it is vibrating.

The designers say its tracking software isn't just for straight couples, but for relationships of all orientations.

It also comes with an inductive charging station and dual LEDs that reveal its status.

The one-size-fits-all toy also vibrates to help provide stimulation during sex.It connects to your smartphone using Bluetooth, and has a battery that lasts around seven hours when it's not vibrating

The project is currently raising money on Indiegogo and a $100 (£65) pledge can secure you a device

'It doesn't just have to go on a penis,' Reid Mahalko, a sex and relationship expert, says of the Lovely in a promotional video.

'You can put this wearable on a dildo, you can put it on your fingers, you can use it on a toy on yourself.

'It's really only going to be limited by the ideas that you come up with.'

The project is currently raising money on Indiegogo and a $100 (£65) pledge can secure you a device.

If successful, people who donate to the campaign can expect to get their 'Lovely' device by June 2016.