I suppose it depends on the definition of 'cheat'!
I usually will use a walkthrough if stuck, but tend not to use them until my second play through once I have beaten the game.
If I am stuck on something that a guide won't help with - for example - destroying the Geth guns in the last area of Overlord in the HH.....
I got royally stuck and asked my daughter's boyfriend to have a go, funny thing was he did it straight away and watching him do it, greatly helped me do it the next time I played through. So it depends on whether getting someone to do it for you but then learning through them how best to do it yourself is cheating or not? If it is, I cheated, but vowed to do better next time

Other than that, I don't cheat, I play.