Charlotte's hot new beau catches her off guard when he confides that he'd like them to find a woman to join them in a ménage à trois. The idea sends her imagination into overdrive. Over brunch Samantha quips, "Threesomes are huge right now. They're the blow job of the Nineties." (Anal sex was the blow job of the Eighties, she adds.) Her caveat, though, is to be the guest star -- the woman who just comes in, screws and leaves. Barring that, she advises that you choose a stranger rather than a friend, such as someone you meet in a bar.

What they're telling us:
Although your girlfriend may be open to sharing her boyfriend with another woman for a night, the stakes are higher for her than for the newcomer who doesn't have an emotional investment in the relationship.

Follow-through:
Agree on the guidelines and boundaries with your girlfriend before you initiate a three-way. During the performance, pay extra-special attention to your girlfriend. Also, don't suggest you do it with her sister or one of her friends. It's too messy.