My wife likes softcore stuff with real couples and storylines. She says it feels more natural and less fake. We sometimes watch together, and it actually turned into great foreplay.
She loves cuckold, humiliation, water sports, dogging, both lesbian and gay porn especially watching tiny cock bottoms fucked hard by big cocked tops, gang bang and group sex, BDSM, she loves a wide variety.
I'm partial to anything that looks or feels like real life- housewife situations. Husbands watching, eye-contact, MMF is always sexy. Classy swing party or club scenes are a real turn on- Dorcel Club and Luxure are very sexy.
Recently I have found myself watching more interracial scenes, I know it's a bit cliched but the contrast in skin tones and extremes of anatomy are a real turn-on. My husband likes watching videos with slim blondes (Scarlet Red is a favourite as he says she looks like me when we met) .
I'm not into watching pain though, not my thing (just pleasure!!)