What is the difference between "should X" and "should be Xing" in the following contexts? Or are they interchangeable?
- 10 Things you should do to improve the health of your hair.
- 10 Things You Should Be Doing to Boost Your Immunity.
(From Google searches.) Is there any slight difference between using should do and should be doing there?
I believe in making the world safe for our children, but not our children's children, because I don't think children should be having sex.
— Jack Handey
Would "I don't think children should have sex" be possible here?