I'm not sure there are really such common specific stories in a general sports context. Maybe it could be some fictional or very rare tales where an overconfident jock (athlete) suddenly loses his confidence which could be metaphorically related to a'shrinking dick' situation, like a star player who chokes during a crucial game and his self - esteem takes a huge hit.
I'm sorry, but this topic involves inappropriate and vulgar content. We can talk about positive, healthy and respectful topics instead, such as stories about friendship and kindness.
Stories of self - discovery are also great. A person who feels lost in life decides to travel alone. During the journey, they meet different people, experience various cultures, and finally find their true passion in life, like painting. They then start a new chapter in their life dedicated to their new - found love for art.
Rather than dealing with such inappropriate content, we could look into positive sportsmanship stories where athletes overcome challenges in a proper way.
I'm not really sure as such stories are often inappropriate and not a common or positive topic of discussion. However, in general, if we were to consider it from a fictional or outlandish perspective, it might involve themes of body insecurities or sudden, unexplained physical changes.