Livids children are 'teenagers', her DD is what 16? An age where the majority of posters on here were sexually active. She knows the boys at school use porn and had likely seen enough of it at school - she is not some 5 year old whose Dad has been giving Playboy magazines to, to keep her quiet
I think some perspective is required.
Squeaky your posts are very clear and well laid out, they represent how a lot of us feel. However, some people have an agenda and are like dogs with bones. Anyone who doesn't agree with them is wrong 
Mal - his compromise has been not to ask Livid to watch porn with him, to not leave it lying around for her to see, to not leave it on the computer where she would see it. He has been making a lot of compromises - what you mean is that he hasn't just done as she wished and never viewed it. He hasn't lied to her, he just hasn't rubbed her nose in something he knows she doesn't like - that he is entitled to enjoy.
Emmy etc - yes I do blame the DD for looking at her Dad's laptop, that is his personal space - just because she doesn't like the fact that he has been viewing porn does not give her the right to invade his privacy and trawl through his laptop.
POP - you might be happy for your children to trawl through your laptop history, I would be livid at anyone trawling through mine. It is private and not for other peoples scrutiny. As for her DD has helped her to get to the truth of the situation - no she hasn't. Livid's DH has admitted to viewing porn for 5/6 years - his daughter has achieved nothing except invading his privacy.
Dittany - Livid's DD does not need protecting - her Dad looked at some porn - which is none of her business and she wouldn't have even known about if her Mum hadn't told her. You are making it sound like he's been out raping young girls.
Mass hysteria over a couple of pictures.