I have no doubt this is true, there are really people out there this sick.
People who will turn a blind eye, because they don't want to be alone. Some even go as far to think of the child as some relative, snatching harlot
.
People like this are all to common, that's why sexual pervs target them. They are so fucked up with their own issues, they can't think straight, like a level headed person.
They are so desperate, for whatever reason, to skirt around things and keep what situation they have, the children come last. It's turned away from.
Any NORMAL person, without issues, would have this child away from this man without a split seconds thought. Op can't do this because she is quite clearly ill herself. Be it depression, other MH issues, whatever. No one of normal mind would be putting up with this., he has targetted her for this reason.
Sadly, how many mothers do you see in the news go to prison, because they allowed abuse by their partners to go unchallenged. Plenty. It's a sad thought, but I'd be very suprised if this wasn't real.
It's just so classic, the DD is right down there, the op was more concerned with the porn and if she could change/forgive that initially.
Best thing that could happen is the DD mentions it at school and SS gets involved. I don't think this op is anywhere near realising abuse is already happening, as he'd be gone. This is where organisations like SS, are needed badly.