Definately off. There is no question. Ive never heard of such a thing. Plus the kitchen floor is too slippery with socks on! Well the bathroom floor too.
Now that I think about it, I dont think I have ever had sex with my socks on.
Well, unless you count the times in the car when you make do with what ya got on. :lol
Off. But there have been times when i've had no time to take them off. And i just try to while going at it lol. It's tuff sometimes trying to take them off with your opposite foot.