Women have revealed to scientists how they increase their sexual pleasure during vaginal intercourse.
Keen to help women "understand, communicate and advocate for their sexual pleasure", a team from Indiana University surveyed more than 3,000 female adults from across the US.
Nearly nine in 10 (87%) of the respondents are fans of "angling" – "rotating, raising or lowering the hips during penetration to adjust where inside the vagina the toy or penis rubs".
Others partake in "pairing", "shallowing" and "rocking" to help them climax, the results show.
Sexual pleasure has been linked to improved physical, social and emotional wellbeing, "particularly for women", the scientists wrote in the journal PLOS One.
Viewing this pleasure as a "critical scaffold" to wellbeing "reframes" a woman's "enjoyment of sex as a fundamental human right".
Often to achieve this, a woman requires confidence, communication skills and an "ability to negotiate" with her partner.
Feeling "scientific literature" on this topic was lacking, the Indiana scientists analysed thousands of women aged 18 to 93.
The women were made up of "many under-researched and often harder-to-reach populations across ethnicity, economic classes, sexual orientations, gender identities and internet access".
"We asked thousands of women what they do to experience more pleasure from penetrative sex and found there are four techniques that work for most women," said study author Dr Christiana von Hippel, from sex science site OMGyes, which provides users with the "latest science about what feels good and why".
"Our company gave them descriptive names and created tasteful diagrams, animations and videos of women of all ages explaining their own experiences."
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As well as angling, more than four in five (84%) of the women are fans of "shallowing", penetrative touching just inside the entrance of the vagina.
Just over a quarter (76%) use "rocking", when the base of the penis or sex toy rubs against the clitoris during penetration, staying all the way inside the vagina rather than thrusting in and out.
Nearly seven in 10 (69%) partake in "pairing", when a woman or her partner stimulates the clitoris during penetration.
"We hope bringing this important knowledge out of the shadows into the light of day with clear language will empower women to better recognise, communicate and act on what they want," said Dr von Hippel.
PLOS One's senior editor Julia Robinson agrees, adding the research "contributes to the base of academic knowledge, and explores an under-studied topic that is related to women's health and wellbeing".
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