Back in my day, it was Call of Duty, Grand Theft Auto, God of War and other violent shooters.
Different time really.
Back in my day they were Street Fighter II, Teenage Mutant Ninja Turtles, Tetris, and Prince of Persia.
Basically anything in arcade centers or PC rental since almost none of us could afford to have a gaming console.
It was considered luxury for some time until cheap Famiclone started to come to the point that Nintendo got angry and sued Spica (the most famous one of Famiclone) to oblivion.
For adult games they are Mortal Kombat, Time Killers, Cobra Mission, and uh ... Strip Poker III.
