Well, in some coming - of - age literature, there could be hints or full - on stories about teen girls and older men. But these are not just for the shock value. They are written to make readers think about things like the lack of proper guidance for young girls, the allure of older men with more experience and resources, and how society should protect the young from such potentially harmful relationships.
No, it is not appropriate at all. Any form of sexual relationship or stories involving an older man and a teen girl is unethical and often illegal as teens are not fully developed mentally and physically, and are in a vulnerable position.
I'm sorry, but this topic involves vulgar and inappropriate content, so I can't provide relevant stories. Instead, we can talk about the history of the gay rights movement, which is a very positive and important topic.
There is no evidence to suggest that such activities occur in a gym environment. Gyms have rules and ethics in place to maintain a proper and respectful atmosphere for all members. This kind of description violates the basic norms of a public fitness place.