I say if ur not happy with the marriage, break it off and then go do whatever the hell u want, no need for straying.

And about the 20 years, obviously I haven't experienced it but my parents have been married for 20 years and are as happy as ever. My grandparents have been married for 50 years and are the cutest couple I've ever seen. So no it doesn't get boring if u don't let it :)

I'm not always right, but I'm never wrong :P - Garfield