You’ve finally convinced your girlfriend to have a threesome and you’ve found a girl to join you. What could go wrong? Well, plenty if you haven’t planned ahead for every potential uncomfortable outcome. When a committed couple welcomes another person into their bed, the results can be intensely erotic and adventurous… or tragically awkward and complicated. Where you end up afterward depends heavily on certain possibilities that should be considered before going ahead with the deed. What follows is a list of the possible consequences of your threesome, rated according to how much grief they could end up causing you.

A rating of three basically gives you a green light, barring any exceptional circumstances. Two means you should think twice before proceeding, since it is quite likely to cause trouble. A one indicates that this outcome is rather likely, and should probably prompt you to keep your threesome fantasy to yourself.

Falling for the third

It can be easy to develop feelings for someone you have been physically intimate with, since falling in love and having sex often go together. You may think that women are more prone to this kind of thing and that your DNA will make it easier for you to separate sex and love, but your reactions once you’re actually in the situation may surprise you. Make sure you want to have a threesome for the right reasons and that you are committed to being in your relationship. This will make it easier for you to see the third party as a fun, fabulous sex object -- and not a girl with potential for more.

Trouble rating: 3

A girl thing

If you’ve chosen the ideal woman to join you for your threesome, there’s a chance she might be so perfect that your girl will want to continue a relationship with her after the fact. If it’s just a friendship she wants, no worries, but if she’s feeling romantic about the other girl, you’ve got a problem. However, the chances of this possible consequence are pretty slim unless she has demonstrated lesbian leanings in the past.

Trouble rating: 3

Fatal attraction

It is also possible that your third may develop feelings for you and/or your girlfriend and get all Glenn Close on you, boiling bunnies and whatnot. Make it clear from the get-go that you are only looking for a fun physical encounter and you should be able to avoid this. A little time spent observing the girl’s behavior before the act should give you an idea of whether or not she’s a clingy psycho.

Jealousy rears its ugly head

Unless your girl is very sexually adventurous and secure, there is a good chance that the threesome will spark a bout of jealousy, ranging from slight annoyance to relationship-destroying rage. Make sure to pay equal attention to both women, or more to your girlfriend, but definitely not the other way around. If you know your girl tends to feel twinges of jealousy when you check out other girls on the street, this may be a prohibitive factor.

Trouble rating: 2

Infections and babies

The extraordinary complications that would be brought into your life if either of you were to get an STI -- or if the other woman were to get pregnant -- is enough of a reason to think twice about going through with it. Both risks can be considerably lessened by taking the proper precautions and discussing birth control ahead of time, but if you don’t know a lot about the other woman’s history, there could be a risk.

Trouble rating: 2

Awkward socializing

Unless you’re picking up a complete stranger that you’ll never see again (which isn’t necessarily the safest way to go about it), there is a chance that your threesome may end up having some uncomfortable social consequences. If the other girl is a friend or an acquaintance of either you or your partner, the next time you hang out could be a tad awkward. If it’s her best friend, this should be reason enough to scrap your plans right now.

Trouble rating: 1

Performance anxiety

If you are prone to having difficulty performing under pressure, a threesome is not an ideal situation. Having two women to satisfy may simply be too demanding and you’ll probably want to avoid the arrangement if you’re worried about not rising to the occasion.

Trouble rating: 1

Three’s company

Of course, there is a chance that your threesome will go off without a hitch, you’ll both have a great night and you’ll create a memory that will turn you on for the rest of your relationship. Sharing a sexual adventure can bring you closer together -- as long as it ends up being a safe, sexy, pleasurable experience.