Courtesy of Cracked (and indirectly passed along by Lu - thanks!):
There's absolutely nothing wrong with this doll, as long as it's not in motion. Sure, maybe a crude teenage boy could say that his right hand is sort of positioned like it's holding an invisible boner. But when you activate the little lever on Tarzan's back, that's when the magic happens.
There's no mistaking what he's doing. They implanted a mechanism that really can only do that. Mattel changed the doll after approximately 100 percent of the boys who picked up the toy started making Tarzan jerk off within about 10 seconds.
See the other 14 toys here.