Generally speaking, I have to go with sex.
But it hugely depends on how the question is to be understood.
If it's a general choice between a lifetime full of sex but with no gaming or vice versa, I would definately chose bangin.
If it's just on one occasion you have to decide between sex or gaming, it's very circumstancial what to chose. There have been singular times when I actually preferred gaming over sex.
Once when my GF was out for a week, but returned a day early and I had already... er... exhausted myself that day because I was bored all day long.
Or back when the relationship was fresh and we were copulating like rodents and I haven't yet broken my gaming habits to her, there were tims when I'd rather played a video game than havong a second or third go that day.