I think in this instance its right I tell you i'm a man, and here's what I think.
Not justifying, just explaining.
On some Porn sites, and that could be one of the most commonly known ones, if you click on a link, it opens up a new window, and the old window automatically goes to another web site. These could be a different porn site, but often for me it does to webcams, or escorts. I have no interest in these, and close them down, but they do come up. The cam sites do go to indivduals, the escorts have never done this.
I can imagine why a man would look through interest, but have no intention of visiting. Its not nice I know, but but it doesn't mean he's serious about visiting one.
However, if I was to be found with one of these on my screen, I'd be at pains to show that I had done nothing and it was an accidental feature, and be completely ok to show messages, phone bills, bank statements.
I can understand why someone wouldn't believe that the escort page wasn't there as an accident, and want to prove it.
I do think however its more unlikely that the individual escort page has popped up as an accident. I therefore do think its really ok to ask for proof that nothing else has happened.