Monogamy

I am steadfastly for monogamy. Adultery is almost certainly going to make a dent in trust and intimacy, and in many cases I've known, it has destroyed them altogether. A woman who is conducting a secret affair has to become deliberately deceitful…like a CIA agent or spy. She can't just come home and spill forth the events of her day. She's got to think, What can I safely talk about, and what have I got to keep to myself?

So even when the infidelity isn't discovered, it changes who you are. A person goes from being a candid, open human being to a secretive, hidden one.