• Gore
• Medical/Science
• Monsters & Xeno
• Non-penetrative sex (frottage, intercrural, dry-humping, etc)
• Phone Sex
• Dub-con/Non-con
• Enthusiastic consent
• Hands
• Snark
• Incredibly elaborate smut setups
• Oviposition
• Diverse combos of genders and sexualties
• Non-traditional or fantastical sex (magic sex, substituting different actions for sex, sex that goes outside of what is normally possible for humans, etc)
• Bondage
• Power struggles and imbalances

+More that come and go and would take too damn long to list here lol