marty be typical guy who want to spice up his boring marry sex life . he get the idea that he should get his wife together with another woman and he do this because he be self centered and of course . at first his wife do not want to be with another woman but soon enough she like it . she like be with another woman so much that she start to reject marty and his whole plan blow up in his face . i think marty get what he deserve and it pretty funny . he get more than he ask for and that be what make the movie great . the whole scene with the sister be pretty funny as well . wish do come true and sometimes they come true a little too much .