Data from: http://news.BBG site.com/specials/adult/ (18+ and games info also be included).

Sex:

Amazonika Rising
Battle of the Valley
ElitePimps
GoonsLife
Hittin' The Clubs
Kiez King
Mafia-Rule
My Minx
Narcotic Wars
Playboy Manager
Sexual Adventures
Sin City Hustler

Horror:

Bane of Sin
Bio Nightmare
Bitefight
Blood Wars
Bloodletting
Carnage Blender
City of Eternals
Crimson Moon
Darkness Rising
Dawn of Kings
Eternal Wars
Genleo

Violence:

2452TheGame
4x4 Country
A1 Mafia
Agents Target
Alberta Gangsta
Alberta Streets
All Out Mafia
Anarchy Island
Armageddon Conflict
Arts of War
Assassinators
Awakened Lands

Any addition? Post the game name.