Is your spouse still friends with their exes?

Does it bother you? I've been getting mixed reactions to this.

My best friend doesn't like her husband getting chummy with a female co-worker, let alone still be in contact with an ex girlfriend. She seems to be the one wearing the pants in that relationship.

My other friends, they don't let their boyfriend/husband have any contact with their exes. It's just wrong as they put it.

Personally, it doesn't bother me. My husband is keeps in touch with his exes. Sometimes we'll hang out with them and their significant others. We're all adults and what happened between them was in the past.