I do that, and I just look at porn and chat on YA about the fact that my wife won't have sex with me. So, there isn't anything she couldn't guess at.
Why don't you just show up to the computer when he's sitting there, and be wearing a robe with nothing underneath, and open it up to his face...
probably. one time i went to see our counselor alone and she said that an affair was an option. she also told my wife to get some porn and watch it. i think she knows that some women are frigid and they need a kick in the pants otherwise the man is going to go down in flames.
Take your keyboard to Batteries Plus store and ask them to help you get a large battery (like a car or boat battery). They will help you to find the voltage & current requirements that are marked on your keyboard. They will also help you select the right cable to connect from the battery...