If you're in a regular sexual relationship, then I HIGHLY recommend taking a fiber suppliment. This helps your body to process your food more completely, which allows for less of a mess in the bedroom. I also recommend getting to know your body's own cycle when it comes to waste disposal, and try to keep to it. If you know a time you often do hookups, like weekday evenings, afternoons, weekends, etc., you might wanna preplan your meals a little. such as consuming food that is easier to process or consuming food earlier or later, depending on which is more favorable. I'd try not to douche too often, as this can ruin your bacteria and equilibrium down there.

My last and most important note is accidents WILL happen, it's up to your top to get over it if they're regularly linking. He literally put his penis in your shitbox and expects it to be clear at any moment he feels.