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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.
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.
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.
MIA Fem sees users answer questions on smoking, the amount of coffee they drink and even tampon use.
This information is not shared with Facebook immediately but it allows the app to recommend specific articles to the user, with those articles then being shared with the social network.
Knowing a person's mood or whether they are pregnant or not allows advertisers to personalise ads based on shopping habits.
This brings in revenue for the app and its developers but has raised questions of privacy and security.
Deborah Peel, a psychiatrist and founder of the nonprofit Patient Privacy Rights, warned that people just expect their health data to be protected by the same laws that protect their health information in a doctors office.
However, many apps aren't subject to the same data laws.
She added: 'Most people would want to make their own decisions about what's known about their sex life, about whether it's shared or not.
'Right now we have no ability to do that.'
A Facebook spokesperson told Mail Online: 'Contrary to BuzzFeed's reporting, our terms of service prohibit developers from sending us sensitive health information and we enforce against them when we learn they are.
'In addition, ad targeting based on people's interests does not leverage information gleaned from people's activity across other apps or websites.'
The company added that its terms of service stop app developers from sharing health or sensitive information.
Facebook says it has been in contact with both Maya and MIA to notify them of a possible violation of those terms, in statements from the companies included in Privacy International's report.
Mail Online has contacted the developers of both apps for comment.
John Paul, Founder and CEO of Plackal Tech, the company behind Maya, told Mail Online: 'Maya does not sell data to Facebook or any third party. We have in the past used tools from Facebook, strictly to improve our product experience. We have proactively removed these tools from all versions of the app due to concerns about privacy.
'All data accessed by Maya are essential to the proper functioning of the product. Predicting information pertaining to menstrual cycles is complex and dependent on thousands of variables.
'Post sign up, our users can export their data and delete their account whenever they choose to.
'Maya is on a mission to build products that make a positive impact in the lives of women.
'We take pride in the trust that our users put in us and follow best practices on data privacy.'