Needless to say, sending material about office affairs to people's office e-mail addresses is a bit creepy. If you're not married and not having an office affair, it's just odd. But if you are guilty as charged -- boy, imagine the bile hitting the back of your teeth when you see this e-mail's subject line pop up in bold!
Of course, the best way to avoid wrecking one's marriage by having an office affair is ... wait for it ... to avoid wrecking one's marriage by having an office affair. Naturally, that doesn't come up -- but this does: "Office affairs and romantic relationships at work must be handled delicately and on a case by case basis." In other words, don't confuse Lena and Gina and Tina when you're breaking up with them at 10:15, 10:30, and 10:45 in the break room. And don't hit "reply all."
Other pearls of wisdom:
Keep it short and simple. "To end a workplace affair, be direct" ...
Eh, how about, "You're fired"?
Do it on your own time, not office time. "Tell them in person and in public area where a scene is less likely to take place. Do not break off the affair at the office" ...
"Thanks for coming to meet me at this cafe. You're fired."
Make it final. "When you end an affair, make it clear to your affair partner that you are ending it completely with no more friendship, e-mails, or lunches. Be consistent. If you waver, look inside yourself and find out why" ...
And no emoticons, dammit!
As for "wavering" -- you mean, if a married person isn't strong enough to break off an illicit affair with a co-worker he or she might have to "look inside" and realize some degree of moral weakness led to this situation in the first place? The hell you say!
"You're a really lovely person. And you're fired.
"Just kidding! But you are getting transferred to Kankakee, Illinois."