Your PE is probably a result of your anxiety as you might have already figured out. You are probably thinking about getting caught, being heard, being embarrassed or something of the sort. I don't see why this is an issue, its a perfectly natural reaction. The only thing you can do is to just stop caring who the heck is in the house. But that is easier said then done no?

Or don't do it when people are in the house.

Or know that it will happen under these circumstances and accept it. Just keep an eye out for PE if it crops up when you aren't in this situation.

Yea, that too, but I didn't feel he would care much for "don't do it when people are in the house" since he probably did this often anyway and isn't about to stop. =)