In this day and age, everything is available in abundance. I guess it all boils down to your value system, how much tolerance we have and what we believe in.
Very true and ideally how it should be for a momin/muslim.
However, with the posed question from the thread starter, it seems that, that boundary is already crossed. The question remains, Can a couple, or Not? Legally they can. Morally, i guess it depends on both.
It's a tricky subject. I am hoping Brother Psyah or someone else, can shed some light on it in the light of some references that either allow it or forbid it. Obviously there are certain things that even married couples cannot do (from a religious aspect). Is this one of them?!...