ST: some things, are not a "to each his own" issue.
There are apparently lots of people who think that "swinging" is just fine, and it doesnt affect their marriage. They're wrong. it does affect their marriage. It makes it a different marriage, than between two people who are completely 100% committed emotionally and physically to each other.
Now, you may not want that kind of marriage. you may be quite content with only the first kind. That is certainly your choice. I suggest that you dont try to fool yourself that there is no price to pay, however.
The thing is,... it's the second type of marriage, that best survives things like affairs, MLCs, and separation.
My current status: june 2006. Wife ran out and filed D. Finalized Jan 11, 2010, after 12.5 years M. 3 wonderful sons caught in the middle