I agree, but, a lot of people believe in very open marriages. As long as both parties agree, there's really not much we can say.
Is it wrong? Well, that depends on who you are and what your beliefs are. I believe in manogamy, I love my husband, I meant my vows when I said them, I would never be able to share him with someone else, and I would never expect him to share me with someone else. I love him, and to me a part of that love is staying faithful to him.
There are all types of "relationships" out there. It takes two to tango, so if both of them want to dance, then that's their business. Sadly, most times they'll do the deed and end up back here asking us how to fix their marriage because the wife fell in love with the other guy.

