Apple's sex app
Apple's new sex app lets you record how long it lasts Reuters

Apple's iPhone can monitor your sleep patterns, how many calories you burned, vital statistics and much more.

Now users of the technology giant's Health app will be able to track their sex lives with a new feature called "Sexual Activity".

The sex-tracker app will allow you to log the date and time you had sex and whether you used any contraception.

Women will also be able to monitor their menstrual cycles and specific physical changes, such as basal body temperature, cervical mucus quality and spotting.

The features will be available on Apple's HealthKit app as part of the iOS 9 operating system update.

Apple will keep the data private by default, but you can choose to send it to your doctor or anonymously provide your information to universities and physicians for research studies, according to American technology website Cnet.

The update, detailed by Apple's senior vice president of software engineering Craig Federighi at the company's 26th annual worldwide developers' conference in San Francisco this week is seen as an attempt to address women's health issues.

News of the sex monitoring feature on the new iOS 9 operating system was met with a tepid response on social media.

Dating and sex smartphone apps have become common, appealing to a variety of sexual orientations and fetishes.

The most common apps are Tinder and its ancestor Grindr which is aimed at the gay community.

But the new Apple app is thought to be the first of its kind and is aimed at promoting users health, CNET reported.