I'd be dead meat if I tried to find that but how do you know that guy didn't go to the site on purpose and is just trying to blame you to serve as a cover-up to his family that he's visiting that site. If his wife or kids walked in, he could've said "I meant to go on a site about chickens!" and wrote out the e-mail to you. Really, many people would lie that low (Not any of you, thankfully!)
My mother even once went on a site like that. When I came in her room, she screamed "GO! This isn't YOUR space!" If my dad had been following me, she could've easily said "I meant to go on my e-mail" or something like that.
You don't know how he got on that site, so how do you know he did what you said?
Just a suggestion to what could've gone down.
Best wishes,
Fluffy
ETA: But my mom had brain cancer when this happened.