Mastodon does not have an automated feed like Twitter does, so what you see in your feed is people you follow and their boosts. Just don't follow people who are interested in your sex life.
Personally, I don't want to follow people, I want to follow subjects. I want to read Jay Expert's posts on their speciality without their posts on politics and breakfast. Maybe Bluesky feeds will make that possible (in which case Bluesky kills Reddit).