Interesting post. If you discussed previous sexual encounters/relationships in the past and your DH wasn't honest with you, l would have an issue with the situation. However it sounds like you didn't and you have found out subsequently. Prostitution has been around for hundreds of years and it will be around for hundreds of years in the future.
Men marrying girls, rape in war, slavery, murder and lots of other things have been a feature of the world forever. It doesn't mean we just shrug and ignore it.
There is another very interesting thread on here entitled I was an escort you can ask me anything. OP I think it would be helpful for you to read. A lot of women who work in the sex industry do so as a choice due to the fact they can make a lot of money they couldn't make otherwise, I don't think it is for anyone to judge them. Obviously it is different for women who are coerced or trafficked.
We don't judge the women, we judge the punters. A lot of women might be doing it for shits and giggles (although I don't think it's that many who aren't coming into it after or during abuse) but there are lots of trafficked, addicted and pimped women. How high does the chance have to be?
If the situation with paying for sex is in the past then I think that is where it should be left. In my view it is a mutually beneficial transaction between two people.
It's not. Only one of the two has an increased chance of PTSD. There is no way to make sex work safe/
However the situation with the Instagram is different it is in the here and now and I would have an issue with it. Having said this I think all men view and use images of women, everything is so accessible these days online. Have I got any evidence my DH views or uses pornography absolutely not but I am not naive enough to think for one minute he doesn't.
I find it really odd to have more of an issue with online pictures on instagram, rather than him using women he has no idea how much of a lack of consent he's abusing.