You can easily buy black washcloths with the words “makeup” stitched on them. People put them in a basket in the bathroom. I suggest a basket by the bed with black hand towels and the word “juice” embroidered on them. Added bonus of using black is that the contrast when using a blacklight is better.
Signage "The hand towels in the basket aren’t just for hand jobs, if you spooge anywhere please use the night towel. " HH has a good point. I think throwing few condoms in the basket will make their purpose clear and help society.
Oh, don’t spoil the fun!