where's option 4: none of the above.
I'd wonder what the circumstances are. If you're a happy couple and she's bored, you better step up before someone else does. If you don't have the energy or desire to do so, they you need to reprogram your lifestyle to include other men as a recreational outlet. Cheating is lying. Sex is just sex. Its getting aroused, getting laid, and getting off. Nothing more. I'd see what she thinks of you getting sexy texts from women. If you both can handle it, maybe its going to add some caliente into your life. Good for you. If you could have a wild time once a month, why not. After being with a partner for a decade, you might need it, so don't knock it.