"(ne sommes-nous pas ..." means "aren't we..." - Nothing special about lovers in that expression.
"Pas bon" = "Not good"
"pas sale" means "not dirty"
"Pas pire" means "not worse".
"n'est pas" means "is not" in English.
Touche pas --> Do not touch
tu n'es pas gentil, pas gentille
Pas de. If you are using it with a verb, then the verb goes in between like this: Pas ... de.
N'est-ce pas means "isn't it" in English.
pas trés bien - not very well
n'est-ce pas means isn't it in French.
Ne m'oubliez pas means 'don't forget me'.
Pourquoi pas means 'why not?' in English.