While showing my work to my supervisor, an adult website appeared. Am I in trouble? I will try to make this brief. I am a student at a prominent university in the UK, and while I was showing my thesis work, a website, to my supervisor, the website crashed. Then I was asked to close the browser and open it again.

When I did, it seems a tab of adult content was open from the previous day with explicit content, when that happened, I immediately (without thinking) pressed Cmd-W to close it but it was evident he saw it. 

The conversation continued normally and my supervisor completely ignored it. I feel very embarrassed and I am afraid I could be reported or anything. 

Am I in trouble? Will I face issues because of this? Thank you in advance.

Edit: My laptop is a personal laptop and not provided by the university. I've also used the University network to access the site from my dorm. I also don't think there are university guidelines that prevent us from accessing adult content.
It's embarrassing, but it's also understandable. I think if your supervisor has decided to ignore it, then you should take this opportunity to not ruminate. So silently thank him, and forget it.

I know advice is always easier said than done though. Rumination is defined as "to keep thinking about a problem which had already been, or can never be solved". The real problem had already been solved at the moment he decided to ignore it, so the only problem here is your rumination. To stop it, every time you feel embarrassed about this topic again, my tip is to shake the idea in your head, like it's just a toy. This will make you distract from the negative feeling. 



Related:
• Why You Should Stop Caring What Other People Think (Taming the Mammoth) – Wait But Why
• Straightforwardness, Fearlessness and Improvisation: How to find the fresh perspective? – Ooker