Because you did it and you - at the very least - feel a little dirty about it. :P

It can be while playing single player and online.

I once tried playing Gears of War.

Didn't stop feeling guilty about that for a long time.

I have plenty of these:

· Put the controller on my crotch whenever the vibration was triggered.

· Purposedly not push the button, just to see what happened next.

· Agreed to do a chainsaw duel in Gears of War, only to shot that person when revying his chainsaw, force him to lower it stunned, then chainsaw him myself without having any kind of opposition.

· Spent a considerable amount of time just photographing the girls at Dead or Alive Xtreme 2. Heck, I pretty much wasted days without doing any activity at all, just taking photos who were filling my 360's HDD.

· Boasted about beating games I had never played in my life when I was a kid.

· Rearranging corpses of humanoid enemies (sometimes stripped off their clothes) in a very necrophiliac, disturbing way.

· On the same vein, I purposedly kill my Oblivion character in front of the necrophile woman. Nothing happened, though.

· Stole other player's kills in multiplayer matches.

· Playing two people with one controller. Every death, controller-swap. Friend goes to the bathroom, I die. He gets back, "it's my turn?", nope mate, I haven't been killed yet!

· Fill all four squads in Rainbow Six, then just selecting one of the soldiers, killing my whole team and the other three, then completing the mission as a solo agent. Yes, I could have just put one single soldier. No, I still don't know why I did that.

· Wrote erotic fanfiction of certain characters in certain games.

· Gave that Dark Souls 2 pyromancer the sluttiest clothes I could.

· Masturbated myself whenever the screen in Fable 2 went black, if you know what I mean.

· Despite trying it at someone's house and not liking the incredibly dumbed-down gameplay system, the loosely-tied story structure and the incredibly awful repetitive maps, I bought Dragon Age 2 because I could romance and bang a handsome and hot elf.

· Ruined a friend's Red Dead Redemption save file by making his absolutely moral good Marston a sudden psychopath, taking his moral bar to the extreme low and overall achieving a high ransom for his head. And he was extremely careful not to screw up his Marston, mind you.

· Told my mother the game couldn't be paused (lies), so that I could then keep playing a bit more.

· Told my mother the game couldn't be saved inmediately (lies), so that I could then keep playing a bit more.

· Locking a certain butler in a certain tomb raider's mansion.

· Fantasized the woman I was playing as had a dick.

· Used to let Jill Valentine get caught on the cabin by one of Plant 42's root because I liked hearing her moans.

· I almost always shoot or attack a follower or companion to see if they react to my attacks. To this day it still surprises me that this attitude triggers a special death sequence in Resident Evil 4.

I could probably think of more, but I think this is enough for now.

:| @Wright

Um. threw my controller at my closet during Jak 3's final boss.

I found that one the most shameful for you  

Holy shit dude

Well, you asked for confession, no?

Similar to Wright's, I always run Gauge through eridium puddles because I want to hear her say, "you guys, it's in my mouth!"

I used the cheat menu to experiment with BloodRayne's breast size.

My favorite outfit in Fallout 3 was the BloodRayne mod, come to think of it.

I scaled back the difficulty in the Dragon Age: Awakening expansion for a particular boss. Not because it was too hard, as I'd already beaten it before, but rather because it was long and tedious.

I WILL use exploits for boss battles if they're annoying.

In Killzone 3, I abused the absolute hell out of proximity grenades. I was one of those people that other people complained about on forums. I'd plant two of them ABOVE the doorway and then BOOM. Rinse (the blood away) and repeat.

Used to interrupt friends (cover eyes, shake their controller) as they were winning on a racing game.

Spent a lot of time looking at certain characters at a specific angle while pleasuring myself. Saints Row: The Third/IV, Dead or Alive 5: Last Round, Virtua Fighter 5: Final Showdown, Marvel Nemesis: Rise of the Imperfects, Red Faction 2, X-Men Destiny, Showdown: Legends of Wrestling, Fallout 3/New Vegas/4, Metal Gear Solid 2, Tekken 5/6, Super Street Fighter IV, Ratchet: Deadlocked, Jak 3, DC Universe Online, Warframe, Resident Evil 5...

If someone is in the room and I'm about to get killed, I restart the checkpoint.

Killed AFK players. Hey, a kill is a kill.

Every time I chose a male character on Saints Row The Third/IV, I placed the Sex Appeal slider on 100.

Went for a sun bed session at the gym. Saw a poster of a woman in a bakini, got horny and jacked off in the sun bed.