Would you be comfortable knowing that your SO and an attractive female co-worker hang out?
Not just at work, but after work too. Let's face it, the office can be a very social place at times, what with happy hours, client lunches/dinners, conferences, etc.
Saw a trailer for that new Beyonce movie coming out and though it seems her SO in the film is blocking the advances of his very attractive female co-worker, and yes - it's just a silly movie, still...situations like that are not too farfetched in real life. Have you ever been in a situation where you didn't feel comfortable knowing that your SO was friendly with an attractive, single co-worker?