It seems you're referring to an article titled (The Reason I Got a Friends-with-Benefits Relationship). This appears to be a Japanese adult or romantic content piece, possibly a manga, light novel, or web article.
If you're asking for a summary or explanation of the article's content, please provide the text or a link. If you're looking for a general analysis of the topic (reasons people enter casual sexual relationships), I can offer that instead — just let me know. bokuni sefurega dekita riyuu