Skin Diamond

U.S. Olympian Joshua Mance's dream of bangin' a porn star could still be alive -- 'cause one of the hottest women in the flesh biz tells TMZ Sports she's willing to give him a shot at her gold medal. We shot Josh a few weeks back, and the Olympic silver medalist made an impassioned plea for us to…

He won a silver medal at the 2012 Olympics ... but Team USA sprinter Josh Mance says the real prize would be a date with his favorite porn actress -- the star of "Weapons of Ass Destruction 7." The 22-year-old speedster was at LAX when he told us he's got a serious crush on Skin Diamond -- who's…