They have serious story lines and are less “fantasy like” elements. If you want a more realistic depiction, you need to move out of the realm of yaoi, yuri, shouji-ai, shoujo-ai and look at more mature forms of manga. It’s just a form of art and storytelling. What are the disadvantages of reading YAOI manga (gay sexual)?
Although yaoi is primarily aimed at a female audience, the genre also attracts some male readers, however, Bara, manga aimed at a gay male audience, is considered a separate genre. Yaoi, also known as Boys' Love (BL), is a Japanese genre of fictional media focusing on homoerotic romantic or sexual relationships between male characters, aimed at a female audience and usually created by female authors.