Your title is abhorrent. "Non consensual sex" is rape, not a type of sex. By its definition, there is no choice involved in rape.
Do you actually mean "AIBU to think women in the past were raped more frequently and had fewer protections from rape?"
My DH was really upset by the conversation
Was he not aware that it was legal for a man to rape his wife until the 1990s in the UK?
Was he not aware that legally women were chattels in the UK until relatively recently?
Unaware that married women's income was still treated as belonging to their husband for tax purposes in the 1980s? Married women have only had the right to control their income and be taxed as an individual person in the last 30 years.
Unaware of what was still happening to unmarried pregnant women right through the last century?
Unaware that women had no abortion rights until the 1960s and therefore died or lost their wombs and were imprisoned for trying to end a pregnancy?
Unaware that married women were not permitted to work in the Civil Service? Unaware that most women stopped working upon marriage as they were not permitted to continue employment as a married woman? It is only in the last few decades that it has been any kind of choice.
Unaware that it was legal to fire a woman for becoming pregnant until the 1990s?
Unaware that it was nigh on impossible to get a divorce even if their husband abused them? That the term "rule of thumb" refers to a man being allowed to beat his wife with a stick so long as it was not wider than his thumb?
Unaware that divorced women were not allowed to see their children? Children had no right to a relationship with their mother, even if she had been their primary carer?
Unaware that women were chattels owned by their father and that their marriage transferred ownership to their husband, hence the ceremony of the father delivering and passing the hand of his daughter to her new owner, the husband? Hence a woman's marriage vows including obedience to her husband?
Unaware of women being denied the vote and everything that meant?
Unaware of women being denied access to employment and equal pay, and therefore restricting their ability to achieve independence in order to have the chance to try and escape a rapist husband?
Unaware that beating one's wife was not a crime? That the police would do nothing to protect women being abused?
I guess if he had managed to reach the present day blissfully unaware of those things, then it must be an upsetting shock to learn the truth. Finding the truth confronting doesn't make it untrue though I'm afraid.
I find your view about women being raped and calmly "lying back thinking of England" naive and crass. Why do you think that women being raped in the past didn't find it as traumatic as women who are raped today?
Why do you think previous generations of abused women weren't damaged, distressed and living with PTSD?