Looking for an English equivalent to the Alexandre Dumas proverb "La plus belle fille du monde ne peut donner que ce qu'elle a"

les petits bleus

I like the way Chris Rock puts it: When you’re in a relationship, you’re in a band, and when you’re in a band, you have a role to play. Sometimes you’re singing lead, and sometimes you’re playing tambourine. And if you’re playing tambourine, play it RIGHT! Nobody wants to see a pissed-off tambourine player!