I was at a party with one of my best guy friends (I'm a girl). We were both in a relationship with different people and the whole night we kept promising each other that we'd look after one another and make sure neither of us cheated/did anything stupid. Bear in mind that my boyfriend was one of his best friends and I was close with his girlfriend, too. We ended up drinking too much and started talking, and it came out how we both used to like each other, but we never did anything about it.

Needless to say, this did not end well, and we ended up having party sex in a random room of the party host's house. He was a virgin (so was his girlfriend, they were meant to be saving it for each other). We fell asleep together and I woke up the next morning to a room full of teddy bears and a bloody doll's house in the corner. We'd had sex in the host's 8-year-old sister's bed.