"it would take a lot more than the weight of some curtains to bend even a thin wooden curtain pole"
Word of warning for anyone with a patio door, or any window where you can only draw to one side. We have a fairly bog standard sliding patio door. The wooden curtain pole for it came with a middle support as well as one at each end. As we wanted to be able to bring the curtain all to one side, we had to leave out the middle support, with the result that the wooden pole does sag noticeably. It is on the (ever growing) list of jobs to replace it with a metal pole. I just hope that once we have done this, we don't get the urge to make every other window in the room match it.