tommy On Fidelity

[...] Interesting side note is that my wife expected that kind of thing, welcomed it even. "Even if you love curry rice," she has said to me, "you will get tired of eating it every day. If you have an experience with a girl, I understand, but whatever you do, don't sleep with the same girl twice, because you'll fall in love with her."

This is the great question of karada-no-uwaki (unfaithfulness of the body) and kokoro-no-uwaki (unfaithfulness of the heart).