It's 2014.  Does it really matter if it's a man or woman?

 

I don't feel like digging back through this thread to see if this is the case, but are there kids involved? 

 

I've been married a long time, and I can honestly say my wife has never stayed out all night with any of her friends.  If she had, I would have gotten a call, and a heads-up as to what was happening.

 

If the communication has been as good as suggested in the past, there shouldn't be a need to dance around the issue.  Ask where she was, and who she was with.  You'll know if she's truthful or not if you've been together long enough.

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