What metaphors are used in The Four Loves by C. S. Lewis?

Metaphor:

“For Affection is the most instinctive, in that sense the most animal, of the loves; its jealousy is proportionately fierce. It snarls and bares its teeth like a dog whose food has been snatched away.”

“Every real Friendship is a sort of secession, even a rebellion. It may be a rebellion of serious thinkers against accepted clap-trap or of faddists against accepted good sense; of real artists against popular ugliness or of charlatans against civilised taste; of good men against the badness of society or of bad men against its goodness.”

“By Eros I mean of course that state which we call `being in love’; or, if you prefer, that kind of love which lovers are `in.’”