The tag alias #75983 rimmed_silly -> fucked_silly is pending approval.

Reason: Rimmed + fucked silly, doesn’t need its own tag. Rimming is a form of sex so it should count for fucked silly.

There's also sucked_silly and jerked_silly.

Though I wonder if any of these have been used "correctly". According to fucked_silly,

images and animations depicting characters having sex - or characters who have just finished having sex - with a silly expression on their face as a result of experiencing an extreme amount of pleasure

However, all I'm seeing is, at most, looking_pleasured:
post #2703820 post #2224342
Sometimes not even that
post #3724409 post #2328390

These are nowhere close to "silly expressions", where I expect things like derpy eyes or imbalanced eyes (bottom character) or other really out there expressions, not bog standard blushing expressions of pleasure. Honestly, even fucked_silly seems way overused, for characters that are simply looking pleasured or relieved.