Sounds like you've had a smooth run of things.
What about people who have terrible pregnancies, emergency c-sections, sepsis, premature delivery, baptising baby within 24 hours using hospital priest as advised could die, spend months in hospital and have to travel to hospital every single day - so no rest for either of you at home.
Then when you are discharged after passing a baby cpr unit so you can try and keep your baby alive until paramedics get to you...just in case.
So your now at home with a poorly baby to nurse with medicines every 4 hours for the first 6 months before the medicines taper off over y1/y2 and having non-correcting sleep apnoea so you wake with an alarm every single night for a year before that also starts to taper off over y1/y2.
You spend years under children's hospital travelling for regular appointments. Meanwhile some people might have alway had shit family who now really don't understand the situation and because you are so stressed you decide I have no space for your shit or pain anymore so now you'd rather have no support network than their shit. But you and partner have went into survival mode and push through.
Honestly at this point in my life I don't quite blame you for your naievity and good for you you got a clean run of things.
But not everyone gets a healthy baby and that path will be like a bomb imploding your mental health, your partners mental health and therefore the health of your marriage. I'm nearly a decade down the line and pregnancy and caring for my poorly baby was the hardest time of my life.
Husband and I managed to stick together but once we were finally discharged from hospital more than 3 years down the line, we then spent a year in marriage counselling as we realised we were broken, lost and in hindsight, shellshocked. We're still together but that time in our lives caused deep scars in our marriage as the situation itself is difficult.
And also when you are living through a situation like that you are not your best self and can say hurtful things to one another in heat of the moment, which can be forgiven but some things not forgotten.
So like I say it's good you've had a nice time but be mindful not to go round making sweeping judgements about why women aren't making an effort dressing up for their man in bed.
Maybe the wife is just mentally preparing herself for the breathing alarm to go off again that night and crashing out and maybe the husband is the same but they are holding on and share a cuddle as they go to sleep to wake by said alarm to fly out of bed and immediately start to rouse their non-breathing baby under the high pitched beep, beep, beep... And then go back to sleep cuddled up once more once their baby is breathing and the alarm is reset.
Some people just have to survive and thats the hand they are dealt. Not everyone gets the "nice" outcome.