Bodybuilding superstar Shawn Rhoden -- the 2018 Mr. Olympia winner -- has been charged with 1st degree rape in Utah after allegedly sexually assaulting a female bodybuilder in 2018.
Cops in Salt Lake City tell TMZ Sports ... 44-year-old Rhoden -- who goes by "Flexatron" -- has not been arrested, but a warrant has been issued.
According to court docs first obtained by KSL.com, Rhoden's accuser claims she visited Rhoden in his hotel room in Oct. 2018. The unidentified woman told cops she viewed Rhoden as a mentor.
But during the visit, the woman claims Rhoden forced himself on her -- and despite repeated pleas to stop, he refused.