Questions & Answers about Ellos se aman mucho; no son enemigos.
How do we know se aman means "they love each other" instead of "they love themselves"?
The pronoun se can be reflexive (doing an action to oneself) or reciprocal (doing an action to each other). While se aman could technically mean "they love themselves", verbs like amar (to love) in the plural almost always imply the mutual, reciprocal meaning. Context usually gives it away!
If I want to be absolutely clear that it means "each other" and not "themselves", what can I add to the sentence?
Why is it mucho instead of muchos to match the plural ellos?
Could I attach se to the end of the verb, like Ellos amanse?
No, you can't attach pronouns to the end of a regular conjugated verb like aman. Reciprocal pronouns like se must come immediately before the conjugated verb. You only attach them to the end of infinitives, gerunds (words ending in -ando or -iendo), and affirmative commands.