I'm about 5'5 and my boobs are often at elbow height for guys. What always happens is that guys' elbows always end up lightly pressing against my boobs, like on a bus or in an elevator, or say when there's 3 people in the backseat. I don't know if it's on purpose or accidental.

Even if it's on purpose, it's not egregious, so I don't really move away from it when it happens. The idea that they're trying to feel my boobs as discreetly as possible kinda turns me on. I've also been pressing my boobs onto guys' elbows as an initial gauge of their interest, or show of my interest.

An example of this was yesterday when I went over to a friend's place to work on a school project. He asked me to read something he wrote and as I leaned over to see his screen, I pressed my boobs his arm. I pretended not to notice his cock slowly growing in his pants, while he awkwardly shifted around to try to hide it. Nothing came out of it yesterday but it really turned me on and I'm hoping it can lead to something in the future.

Edit: I'm sure some women do it unintentionally though. I don't wanna set the expectation for guys that every time it happens, it means she's sending signals.