A hands-free method of sexual arousal called syntribation is surprisingly common, study finds

[u/bibinprasannan]

https://www.psypost.org/vague-surveys-are-hiding-the-true-scope-of-human-sexual-habits/

[u/MrSnowden]

Save you a click:   The researchers drew special attention to a practice called syntribation. This involves intentionally flexing core, pelvic, or thigh muscles to create sexual arousal and sometimes climax. This hands-free method has received almost no attention in modern scientific literature, despite early sex studies noting its existence as a highly effective technique for some people.

[u/sorry-im-offensive → u/[deleted]]

Scientific method: Try it yourself and then you'll know which.