There are some sex positions that can improve your chance of maintaining an erection. If you let her get on top, you won't have to worry that the muscles in your thighs and glutes are using up blood that could be put to better use in your penis. Having sex while lying on your side will also help you maintain your erection.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.