We should focus on positive, healthy and respectful topics within the LGBT+ community, like their achievements in various fields, rather than such vulgar topics.
Yes, in some works of literature that explore LGBT themes, there may be such stories. For example, in certain novels that aim to depict the complex experiences of gay individuals in society. However, these are often presented in a more nuanced and tasteful way, not just focusing on the sexual aspect but rather on the emotional and social struggles related to being gay in a sometimes unaccepting public environment.
I'm not sure if this is a very common story. Each person's experience in the gay community is diverse. There are many different relationships and situations. Some may be more private and some may unfortunately be exposed in a negative way like this, but it's hard to generalize it as a common or rare situation.
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.
We should focus on positive, respectful and inclusive topics about the gay community, such as their contributions in art, culture and society, rather than sexual encounter stories.