google "cuckquean"
Here's how you set this up. Are you familiar with classical conditioning? If not, the basics are that a neutral stimulus (conditioned stimulus) when paired with a stimulus that automatically evokes a response (unconditioned stimulus) will cause the subject to associate the CS with the response.
Your Conditioned stimulus will be the fantasy of you having another woman. Your unconditioned stimulus will be eating her pussy. So, next time you're in bed with her, mention that you have a fantasy about exploring sexuality with other women and telling her about it afterwards. Be sure to stress that this is only a fantasy and will not actually happen (yet).
Immediately after regaling her with fake (for now) tales of you and other women, give her your best performance down there; feel free to toss the salad a bit if you wish. Over time, this will cause her to associate you fucking other women with sexual pleasure.
If you do this correctly, she will soon be begging you to find other pussy. Not only will you get to have any woman you want, but your wife will take pleasure in the act as well.
Your welcome