Ski jumping: Wada responds to penis injection claims - BBC Sport
https://www.bbc.com/sport/articles/czej70jyg4eo
Hyaluronic acid, which is not banned in sport, can be used to increase penis circumference by one or two centimetres.
This would increase the surface area of their suits during competition, which, according to FIS, the international ski and snowboard federation, could increase their flight in the air.