I've never seen any research or study that indicates "normal" for married couples to have sex. There are some perfectly happy married couples who NEVER have sex. There are some that have sex multiple times a day.
Normal would be somewhere in between those two places. This is why it's important to talk (preferably BEFORE marriage) about sex. There are taboo subjects in society that you MUST to feel safe talking to your partner about.
Sex and finances are the big two in my experience.
To be "normal" a married couple should have sex as often as both partners want to. This may go from four times a day at the start to four days a week to four days a month; the schedule will vary with age and circumstance. The real question is, why would any couple want to be just "normal"?
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.