Do you notice or look for jizz stains on public or office, etc. walls when you go into the men's room?
If so, and you find one, ever add your own?

Yep, I have done many times. Real turn on to know that some other guys have jerked off there and left their evidence.

My local public urinals are covered in writing and pictures and yes cum stains down the walls, I often add my own and love flopping my cock about in public, been caught a few times and then wanked off with them!
UK here.

I've seen cum stains on public toilet walls and floors. I was in a public toilets once standing at the urinal. There were 2 cubicles one of which was occupied. I could hear rustling sounds from inside and hoped that something might be on. I was listening with my ear to the door when all of a sudden it opened and a young guy rushed out. I went into the cubicle and spread over the toilet seat was a girlie mag still wet with cum. My cock was hard in an instant. I ran a finger through the cum and tasted it. The I sat down wrapped the pages round my cock and shot my own load into the mag as I tried to imagine what that young guy was thinking as he wanked off. Hoe I'd have loved to have done it for him.

Love those sorts of finds too, and as well as enjoying the soaked magazine I have done my own too and left them to be found.

Just yesterday I was in the public toilets at my local mall. I had an raging erection after seeing some sexy girls strutting around and I was wanking hard when the cubicle next to me became occupied.
It was so arousing knowing someone was next door that I shot my load. The first stream hit the wall but the second wasn't as powerful and splattered on the floor right between the two cubicles. I'm sure the occupant of the next stall would've seen it

Loved entering a porn shop video booth with walls totally stained in cum, some with trails that reached the floor. I missed that sweet smell of cum you can only find in porn booths. Feeling a wet fresh squishy load under your shoe is a great bonus.

When I worked in security at a large store my female partner called me to the men's fitting room where she showed me a stain on the mirror and said some guy jerked off in here. I asked her how she knew what the substance was. She gave me a dirty look as I walked away.

Yes I still look for cum stains on walls. When I see them I feel that desire to masturbate and I usually do right there on the spot.

On exterior walls under bedroom windows...An ex GF had a neighbor that peeped on her and her sisters. I witnessed him jerking off from an adjacent window as my GF was changing to go out one night after we had been fooling around on her parents couch. He must have liked what he saw as he shot a few good ropes on to the side of the house before her light went out and he left. I have to admit it was pretty hot to witness that.