But there is a (spurious) correlation between the two that is quite logical (number of sunny days). I also consider it quite plausible that xbox owners either have on average slightly more testosterone, or is bought slightly more by the less enthusiastic gamer crowd (read less nerdy in their hobby). See also the Wii.
Yes there is a factor that both things are correlating to but they have nothing to do with each other.
If what you suggest was true then the common factor is testosterone. However that has no factor on your performance. Maybe your desire.
The really correlation is dancing.
People who can dance are better in bed
People with xbox (now with kinect) have dance central and have become better dancers.
People with xboxs are better in bed.
There mystery solved.
edit
Wii dance games dont count. They just make you better at having sex with yourself. All that wrist action.