YES:
Drunk sex
Fight sex
Hate sex
Rough sex
Switching
Over a table/against a wall
Bath/shower/hot spring
Biting
Light bondage (tied down, gagged, blindfolded)
Scar worship
Clothed sex
Muscle
Threesomes/sharing
Fuck buddies/nonromatic/one-night-stands
Fingering
Frottage
Fucked to exhaustion
Dirty talk
Swords/swordsmen

MAYBE:
Accidental stimulation (e.g. close quarters, adrenaline-fueled)
Outdoors
Anonymous sex
Light bloodplay
Delayed/controlled orgasm
Voyeurism
Toys
Public/risk of getting caught
Comfort sex
Powers during sex

NO:
Pregnancy/Mpreg
Watersports/scat/gore/vore the usual
A/B/O
Kemomimi
Crossdressing/genderswap
Masochism
Humiliation