IMO, don't surf through a thread celebrating a girl becoming legal to have sex with while at work, IMO.
If there's an issue just explain to your boss that the thread was intended to celebrate the legal age of consent for her but never supposed to show anything unprofessional like actual nudes.
It has always killed me that someone casually surfing the internet at work would get upset at someone else for something posted in a thread. It's like, guy, you are burning company money as it is- that's on you.
I always wondered what the reasoning was there. If someone is standing over your shoulder or monitoring your page views remotely, it's very obvious that you're visiting a recreational chat forum... but the accidental nude pic on the screen for 2 seconds is what's going to expose you to everyone?
Well, this fucker was surfing the Internet on my time and I didn't care, but the nudes in the thread about a girl reaching the age of consent was a step too far for us!!!
I feel like his work would take far greater offense at his handle being RapesWithaSmile than the actual nudes themselves.