That's from the "if you walk down a dark alley wearing a short skirt after having a few bevvies, don't be surprised if you get raped" school of thought.
No that's not true. We all have a responsibility to take reasonable precautions to protect ourselves. That is why we lock our doors. It doesn't excuse crime when it happens, it doesn't place the blame on the victim. The criminal is always the person who committed the crime.
BUT
We all take steps to protect ourselves from crimes being committed against us.
If you allow someone to take photos of videos of yourself, then you have to take some steps to ensure you know what they are going to be used for. Maybe discuss it with the person doing the filming would be a good start.
I'm genuinely surprised that you openly admit to be comfortable with the fact that you get sexually aroused by material which may not be created or shared consensually.
Created and shared are two very different things. I am aroused by material that is clearly created consensually, where the filming is obvious (not covert) and there is visible and genuine pleasure.
I cannot know if it was shared with consent. I cannot possibly judge that by watching it. I tend to stick to sites where I believe that is less likely, where both partners are on an online forum and communicating with other members, and sharing their pictures, but there is no way I can guarantee that everything I watch was shared consensually.
Stuff like Anna Span, I feel confident is produced ethically.
Are you comfortable wearing a t-shirt, that was made by a 7 year old child, working a 12 hour shift for 50p?
Or drinking the coffee that was grown on the plantation where the workers are paid a pittance?
There is a risk that someone was exploited in so many things that we buy or use. We all justify our choices and decide which risks of exploitation we can live with and which we can't. I'm not convinced that the adult woman who consensually took the starring role in a porn film with her husband, which was then posted without her consent, is more a victim of exploitation, than the 7yr old child worker.