Usually Francisco gives good advice, but I'm going to call him out on this one. Saying that a husband is "insecure" or somehow not a "real man" because he has issues with a wife who wants to make a habit out of going out alone is ridiculous.
Let's not act like real life is always so cut and dry. Most women these days are *****s. That's not bitterness from a previous relationship, that's just a fact. Why is he being less of a man merely for calling his wife out on her disrespectful behavior? There's a fine line between being secure, and being a chump who lets his significant other do whatever the hell she wants under the guise of being "secure".
Guys like Francisco seem to think that every husband should be so perfect, that they'll never have to worry about their wives straying. The fact is, NO MAN is perfect. No matter how in control you want to be, life doesn't always play out that way. It's not insecure to put your foot down when someone is exhibiting bullshyt behavior. And you're not less of a man for letting her know about it. My suggestion to the original poster:Tell your friend to confront her about it, and let her know his displeasure. If she insists on continuing, then he should think real hard about the future of his relationship.
P>S Before the whining starts, I never said married couples shouldn't have time away from eachother with their friends. But it's a whole other story when one of them makes it a habit, or starts taking it too far.