Period-tracking apps may tell Facebook when you last had SEX

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() Apps that allow women to track their periods are sending deeply personal data on sexual practices and health to Facebook, a new report has warned. 

Privacy International, a UK-based watchdog, found that at least two period-tracking apps sent information directly to Facebook, including when the user last had sex.

Other details sent to the social media giant include women's use of contraception, the timings of their monthly periods and their moods. 

The apps mentioned in Privacy International's report are Maya, which has been downloaded more than five million times on Google Play, and Mia Fem, which has more than two million users around the world. 

The data is sent to Facebook through its Software Development Kit, which allows developers to monetize their apps by collecting data for targeted ads. 

Maya asks its users whether they have had sex recently

Describe your mucus on Maya

Maya asks its users whether they have had sex recently and whether they used protection or not (left). It also asks them to describe their mucus (right)

Both apps track women's periods

Both apps track women's periods

The apps mentioned in Privacy International's report are Maya, which has been downloaded more than five million times on Google Play, and MIA Fem (pictured), which has more than two million users around the world. Both track women's periods

Much of the data is self-recorded by people who use the apps for several reasons, including tracking their periods and improving their chances of conception.  

Maya is owned by Indian firm Plackal Tech while Mia Fem is owned by Mobapp Development Limited, based in Cyprus.   

Privacy International found that both apps in question, Maya and MIA, started sharing data with Facebook as soon as the user installed them on their phone and opened them. 

The sharing started even before a privacy policy was signed. 

According to Buzz Feed, the report read: 'When Maya asks you to enter how you feel and offers suggestions of symptoms you might have — suggestions like blood pressure, swelling or acne — one would hope this data would be treated with extra care.

'But no, that information is shared with Facebook.' 

Maya asks its users about their use of contraception, their mood and when they last had sex. 

There is even a diary section which encourages users to write notes on their health. 

All of this information is shared with Facebook.  

Both apps (pictured is Maya) are sending personal data on sexual health to Facebook through its Software Development Kit, which allows developers to monetize their apps by collecting data for targeted ads

Both apps (pictured is Maya) are sending personal data on sexual health to Facebook through its Software Development Kit, which allows developers to monetize their apps by collecting data for targeted ads

Maya asks its users about their use of contraception, their mood and when they last had sex

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