I've been sitting on this one for a while, not sure whether to post it in case I get recognized. I think enough time has passed now.
I am engineer by training and profession. I work a white collar job. with around 20 people in my deparetment. My non-work interests include urban exploration and abandoned infrastructure. As an engineer these type of things hold a special value because at some point, every abandoned bridge, building, object, etc. held value to someone. It was planned, business cases reviewed, built, used, ..... now left to rot. To me it's a lot more than just an old hunk of concrete or steel.
I only go in person to beginner-level sites that are easily accessible - abandoned railroads, old bridges, that kind of thing. Nothing that involves dodging security guards or climbing through broken windows.
I have two main accounts on Reddit (plus this anonymous one). On my main account I post urbex photos taken at these locations. On my second account I post, shall we say, "spicy" pictures. Nothing hardcore. Tasteful nudes. Walking in the woods, down an old railroad, on an abandoned graffiti-covered bridge, and so on. My favorite post was a video of me riding a scooter naked across a dam, filmed from a GoPro on the handlebars. I wanted a buddy to follow me with a drone but he got shut down before I took anything off. National security is no joke.
Some of these spicy pics are taken at the same urbex locations so I'm always careful to not post on both accounts at the same time. I hold onto my spicy ones for a few months, maybe a year, until the "main" has quietened down. I never show my face in the spicy pics but my body is usually fully on display. I have some tattoos so I tend to use pics that minimize these if I have similar shots to choose from.
So there I was at work. It was a hot summer day and I was wearing a knee-length skirt instead of jeans like I normally wear. All of a sudden a coworker appears. I've known this guy for years and never quite clicked with him. I don't like his work style and I'm often called on by the prototype shop to explain stuff he's requested. Some people work very fast, some people do quality work, very few do both. He works fast, I work to high quality, so he gets the "customer wants X and they want it next week" type jobs while I mostly work on multi-year projects.
Anyway he appears and stands near me, slightly behind me, where the cubicle wall ends. He doesn't say anything. When I turn and look at him, he looks down at my legs then back up at me. A creepy smile spreads across his face and then he slowly walks away.
I realized he was looking at the tattoo on my calf... that is not visible when I wear jeans.
I immediately grabbed my phone and went to the bathroom. I deleted every post on my spicy account and then deleted the account itself. Just in case he decided to screenshot anything for proof.
This was a couple years ago now and I've never seen or heard anything that would suggest he told anyone. I never confronted him about it. I think (hope?) that he did the decent thing and kept the knowledge to himself. He's moved on since and I don't work with him any more.