Right you are about that rule of the ancient Greek Olympics. Another of their rules was that only male and no female spectators were allowed. The latter rule may be a possible clue as to how some of those naked wrestling matches may have ended!
Clearly it has his attention! And if that leg hold results in him getting throw to the mat and pounced upon, he may get a more close up view of that boner!
Re post # 9420: Arch intrastate rivals Oklahoma and Oklahoma State just had these two wrestlers going at it! In this pic of the conclusion of their match, they even have matching boners for each other!
Re post # 9421: Coach appears to be checking out his wrestler's ass, but his big boner in front is also worthy of attention as it may be getting from the spectators!
Re post # 9425: Black looks impressed by that big Virginia Tech Hokie boner pointing straight our for all to see/admire/fear (if you are the opponent in black)!