I caught glimpses of their issues.. She sort of came across to me as 'spoiled'...
As for what to expect after kids... It's definitely different.. you no longer have that aspect of spontaniety... Every couple is different.. My hubby and I never had a problem with this (

).. Although when nursing that could be a minor-major annoyance.. But if you have the will, you find ways to even manage the annoyances.. For me to conquer the leaking problem, I wore my bra 24/7 with pads! It wasn't too comfortable leaking all over the place..
But you might be right... If she already had/or still has a libido problem, it could be exacerbated with pregnancy, motherhood and hormones...One, combination or all three in varying degrees.
I thought alot of her sexual issues might have stemmed from her guilt over what had happened.. And that perhaps she blamed herself in part...
Do you remember how much history the 2 had before? Wasn't there a break up or 2 or 3...? Maybe that was when the incident occurred.