No matter how gung-ho you and your partner are about getting into a three-way, there are a few things you should consider before you invite that lucky third person into your bed.

The Couple
Most experts will tell you that if there are any hidden resentments between you and your partner or if you're not on solid ground within your relationship, a threesome will quickly highlight these troubles and force some bitter feelings and arguments to the forefront.

One thing is for sure: a threesome is NOT going to fix a rocky relationship. So, make sure that you both want this. It's a good idea to let your partner know that calling it off is always an option that (s)he can use at any time -- even during the act itself. If your partner isn't into it, then be respectful and don't force the idea. It'll do more harm than good.

The Third
So, who do you ask and how do you ask them? There are no rules on who you should pick, except that you and your partner must both agree on the person you invite into your bed.

Asking the third person can be a bit tricky. Online, Lavalife is a great place to screen for the right person. However, out in the world, it's usually better for a woman to ask a female candidate and for a man to ask a male candidate. That way, the candidate knows that there is no "cheating" going on. Whoever does the asking should make it clear that both you and your partner want this.

The Rules
OK... here's where all that communication you and your partner are so good at will come in handy. Before doing the deed, you have to be able to talk openly and candidly about what you do and do not want to happen during the threesome: