What is the trashiest thing you have done with your partner?

For us it was the time she gave me a blowjob in her sister's living room while said sister was in the next room doing homework. She could have walked in on us any minute. The door wasn't even closed.

Second would be the time I railed her in an alley next to a dumpster on the way home from a burlesque show that got us both really horny. I finished on her face and she walked around Long Beach with a full facial.