I've heard many a person.
Last year, when I was in halls at uni, I often heard the guy in the room next door to me. He was one of those people that would go on about how many girls he had banged etc....but I saw the girls that he was with...I wouldn't touch them with a pole. I remember the first night he brought this...thing home. I said that she wasn't allowed in my room. She was awful.
Funnily enough, I just finished having a conversation with one of my housemates about one of my other housemates: her room is above mine, and whenever her boyfriend is round, I get the honour of hearing the squeaking of short, unrhythmic sex. Yeah. Now, it may be awesome, I have no idea, but from where I'm standing it sounds awful. It's over in a few minutes, and the pace is all over the place. It's just extremely annoying as whenever her boyfriend is over I know that I'm going to have to endure this.
There was a time a few years ago when I was sleeping over at my girlfriend's house with a mate and his girlfriend. We were sleeping in the living room. After my girlfriend and I had had our quiet fun in my sleepingbag, we went to sleep. At some point in the night, I heard what can only be described as "fap fap fap fap" followed by my friend saying "fuck...OH FUCK!" and her saying "that was quick...urgh it's everywhere", to which I burst out laughing.
But I know that people have heard me (or the person I'm with) so...