Same here. "Marriage", by definition means, among other things, being faithfull to each other. If you claim to be married but are having sex or affairs with other people (same gender or not), it's not a marriage, it's a living arrangement. You and your wife are "roomates".
If you really want to see what it feels like to have sex with a man, why not just dress your wife up as a man, buy her a set of prosthetic genitals, and have her do what you want to be done to you? Who knows, she might enjoy it as well.