shiv5468 has written a little scene where the rules of Internet Porn are applied.
"You don't even know what we want you do do." The Second Prefect pouted.
"Don't need to," Hermione said. "Not after the last time. It took me ages to get the mess out of my hair, Severus had back ache for weeks, and Lucius could barely face a cucumber sandwich without twitching. No. More."
Context is that
someone enjoys having sex in cow slurry Not safe for work. More for laughing than anything else.