Starting now, 250,000 people will be asked whether they will anonymously share details about their sex lives as part of the world’s largest population-level study of sexual health and practices. This is the second time the study is being conducted.

How often do you masturbate? Desperate sex researchers struggle to break through

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Do other people have sex as little as I do? Have others cheated, too? When was the first time? Is it normal to be sexually turned on by the same sex even if you identify as heterosexual? How many people have been subjected to sexual abuse?

Eight years ago, the world’s largest population study of sexual practices, habits and ways of expressing oneself as a sexual being was published: Project SEXUS, a 764-page report produced through a research collaboration between the Statens Serum Institut and Aalborg University.

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