Remember Rear Window, the old Alfred Hitchcock movie?
Jimmy Stewart was stuck in his Manhattan apartment with a broken leg, and observed love, angst, creativity, and even murder through his, yes, rear window.
I mostly saw sex through mine.
I was still a bit new in NYC in the early '80s. Had a 5th floor walk-up in a slummy building. It was a classic illegal sub-let. I was young, broke, and lonely.
But I had a really great rear window.
One evening, quite by chance, I saw two people fucking in the building next door, accross the air vent. Woof!! I was glad that I hadn't turned the kitchen light on.That 4th floor bedroom and its king-size bed were eight feet away. A red-haired girl was astride a blonde man. She was twisting and writhing on his cock. And I could see it all!
I spat in my hand and began wanking my dick. They were very hot. She threw her head back, thrashing her long thick red hair. The three of us came at nearly the same time, and my cum adorned the windowsill.
Next day I got a stool.
Every night they put on a show. Every night I wanked off.