Yes!

Why a man would want his wife to sleep with another man?

Because I am proud of her and want others to validate that

Because I enjoy knowing that other men find my wife attractive

Because she has interest in improving her body and appearance as she dresses for other men, feeling sexy and desired

Because I want to bring out the sexy and confident woman in hiding

Because it’s all about her pleasure

Because I enjoy viewing her as the free independent spirit that she truly is

Because I like not having to be in charge all the time, to give up control, to be in a sense dominated and still be loved and accepted by the one that we love the most. All without the guilt or judgment that would normally come with it.

Because it brings out her naughty side

Because I want her to experience as much variety and pleasure as possible

Because she has a much higher sex drive than I do and it fills her sexual needs

Because I want my wife to have the most fun and the most powerful orgasms she can have

Because I get off watching her kiss another man

Because I want to see a larger cock in her

Because watching the love of my life being passionately fucked by another man is the most beautiful and erotic thing I’ve ever seen in my life.

The way her whole being responds to his touch and thrusts, the look of complete surrender in her eyes is the most gorgeous thing I have ever witnessed.

She comes back a new woman; I must fuck her again to call her mine and reclaim her

Because it makes the sex better between the two of us

I am not sure why

As you can see, there are a myriad of reasons why someone would want their wife to sleep with another man.