There is “scant” evidence that the range of procedures men undergo in a bid to enlarge their penis actually produce that result, according to a review by British experts.

The treatments carry a high risk of complications, including permanent numbness, a review of the available evidence concluded. And most men who undergo penile extension are dissatisfied with the results afterwards.

“[The review] found overall treatment outcomes were poor, with low satisfaction rates and significant risk of major complications, including penile deformity, shortening, and erectile dysfunction,” the authors said.