The rumour, first reported by German outlet Bild, suggested that an enlarged penis would allow athletes to wear a larger, more aerodynamic suit.
A larger suit, particularly in the crotch area, could provide more lift, with studies indicating that even small changes in fabric size can significantly increase jump length.
The World Anti-Doping Agency (WADA) stated it would look into the claims, despite the FIS asserting there has never been any indication or evidence of such a practice.
The issue has drawn attention partly because suit manipulation has previously led to sanctions in the sport, including the suspension of two Norwegian Olympic medallists last year.
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