Marty is typical guy who wants to spice up his boring married sex life. He gets the idea that he should get his wife together with another woman and he does this because he is self centered, of course. At first his wife does not want to be with another woman but soon enough she likes it. She likes being with another woman so much that she starts to reject Marty and his whole plan blows up in his face.

I think Marty gets what he deserves and it's pretty funny. He gets more than he asks for and that is what makes the movie great. The whole scene with the sister is pretty funny as well. Wishes do come true and sometimes they come true a little too much.