"受" is a term often used in the context of certain genres of storytelling, notably in yaoi (or Boys' Love/BL), where it refers to the more submissive or receptive partner in a romantic or sexual relationship between men. This genre has a significant following, especially in Japan and other East Asian countries, and has become increasingly popular worldwide through various media such as manga, anime, and novels.
The phrase "[体育老师是个受by]" can suggest a variety of scenarios within the BL genre. "体育老师" translates to "PE teacher," so the phrase might imply a story or concept in which a physical education teacher is depicted in a BL context as the "受" or more submissive partner in a relationship. This might involve romantic or comedic elements, often typical of BL stories.
If you're interested in exploring this theme, you might find it in fanfiction, web novels, manga, or anime focusing on BL content. Note that different works can vary in their level of explicitness, romantic or dramatic themes, and overall approach to storytelling. If you're new to this type of content, it's important to consider what themes or elements you're comfortable with and choose accordingly. If you're exploring such themes for research or entertainment, it's also helpful to consider the cultural context and how these types of stories are perceived or interpreted in different cultures.