which epesode was a bout a man how was telling the trut all the time and was hurting people's feelings including his wife and his kid.

I think you mean "The Social Contract" from season 5?
The patient has frontal lobe deshinibition on this episode, which makes him say whatever he's thinking at the moment without any filter.

I think you mean The Social Contract. And he casts cuddy and 13 in his own porno. Its season 5 episode 17.

Hope I helped. :)

This was the "Social Contract" and it was definitely one of HOuse's most creative moments of telling Cuddy he thinks she is hot without saying the actual words. The moment was not lost on Cuddy either. One of the best Huddy moments. Looking forward to season 7 having some of these times.