ALM, If this porn film wasnt bought properly, but a pirate copy, then it was illegal anyway, I have actually destroyed a porn video my exdp and his cousin tried to watch in my house, it was a pirate copy of animal farm, that belonged to another friend. I destroyed it because it was illegal as well as degrading.
However, this film wasn't yours to destroy, and destroyed for reasons which can only be dealt with between you and your partner, do you know his friend well?
I'd be tempted to call him if I did and apologise, saying that I was angry DD had managed to see it and that I was sorry.
The real problem here is not your DD catching
a glimpse, goodness knows how many children have walked in on mum and dad to no effect, the real problem it seems, is that you do not like your partner watching these films.
That is your decision, I personally do not believe all porn is bad, there are some porn stars pushed into it yes, and there are some movies that cross boundaries that shouldn't be crossed, but I don't think a man liking it makes him a perv.
But you do have every right to tell him it makes you feel uncomfortable and ask him to stop watching them, although if you swap and change opinions with him as much as you have on here then I'm not surprised he watches them, he probably doesn't realise just how much you dislike them.
Don't put up with it because you feel you should, be honest and tell him, it is perfectly fine to have feelings you would rather not have with regards to jealousy and insecurity.
I hope you can sort it out.