Crossword puzzle clue "watch that runs without batteries"

Watch that runs without batteries

Answer to the riddle "What has rivers without water, forests without trees, and cities without houses?"

Hybrid car that runs a few seconds, then stops, then runs again, then stops again...?

Runs too slowly, as a watch

What watch watchers watch

Sounds you might make when I say "Would you rather watch your parents have sex or have your parents watch you have sex?"

Girl-watch or boy-watch

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?"