I've known Carolyn, one of my co-workers, for a few years. A while after she started working in my office, I noticed that her glances would linger on me longer than other people, especially during meetings. Or, sometimes, I'd catch her looking at me for what seemed to be no apparent reason.
At one point, I asked her about it, if she noticed that she was doing it. I secretly hoped that she was because I had been searching /r/gonewildstories for stories similar to our office situation and masturbating to them in my office. Carolyn denied that there was anything untoward going on.
A few months later (and many more masturbation sessions), Carolyn and I went to a meeting at a different building in our company. I had seen an episode of a police drama recently and, while we were in the elevator, mentioned it to Carolyn. There was a scene in the tv show where two characters got it on in the elevator. I pointed out that such a thing couldn't happen in real life because of the security cameras in elevators these days.
Not long after that, I found out that Carolyn had been staring intently on purpose. And we got together shortly after that.