>>58814320Have you tried standing on your knees for extended periods of time, like for example when you're giving someone oral service? You tend to get bruises unless you have a pillow. (Which are not often available in back alleys and other places where such activities are likely to take place.)
That, and it gives them a pon vibe, like they're constantly getting hurt and need a big strong man like yourself to take care of them.
Finally, plasters can also cover up things like lewd tattoos or love bites.