Having a Green Card

Have you ever thought about havignsex with someone you always wanted but couldnt bc you were or are in a relationship. What if you and your other agree to have sex with someone els for one night (both green card). Will yoi let your other have sex with someone else, and you will be sitting at home ( mAle green card). Or will you have sex with someone else and you bf/spouse will be sitting at home (female green card).  Or just never thought about it and will never happen.