IIN to get turned on thinking about wife having sex w/ another man?

we are in our late 30's and I would like to watch my wife have sex with another man .see we have been together since she was in high school .I have been her only lover I feel that both of us have lost out on that so called college free for all experience .I also love to please my wife my main goal when we're together is about her to watch another man do that to her it would be so erotic .