Crossword puzzle clue "having a bottom"

"I don't believe in rock bottom. Rock bottom is like ___."

Bottom bottom line?

Having a better bottom?

Having a bottom

Like either option in "Would you rather watch a video of your parents having sex or your parents watch a video of you having sex?"

Level near the bottom of the minors, informally

Like the top bunk, vis-à-vis the bottom bunk

You'll never get to the bottom of this