Today I wanna talk to you about threesomes from a perspective of an eternal single girl. If you are in the same position, you'll get it immediatelly and if you're in a couple, you should read my post carefully and thoroughly.
I want to stress at the very beginning that I'm not going to talk about a situation when three people are having sex together. (In case you didn't know, a threesome means being engaged in the same activity, not necessarily sex.) I'd like to focus on a situation when a single girl spends time with her best friend and her best friend's boyfriend.
First of all- WHY? There can be a few reasons. You might be really close to your pal and want to avoid the enstrangement. You decide to swallow your pride, your emotions and try to pretend that nothing has changed in your relationship. You feel needed, as long as you're a shoulder to cry on and your friend calls you to ask for advice. But things are getting worse when you find yourself in a situation when you're not needed anymore, when her boyfriend has become her best friend. Now she just tells you occasionally about how good their sex is and that they are moving in together.
Another reason why you can potentially be involved in a "triangle relationship" is quite brutal- you have a crush on your best friend's boyfriend.That's definitely much worse than the former. IMO, if you're using your friend to get to her boyfiend, it's the worst thing you can do. But when you have a crush on him and are loyal to your friend at the same time, you're a hero. And a masochist.
You may also spend time with a couple because you have no other option. Your friend and her boyfriend are the only people who want to meet with you. This should be a wake-up call for you to look for new friends. ASAP. Unless of course you want to be a fifth wheel for the rest of your life.
Now I have some advice for girls who are on the other side- the lucky ones. Please, treat your friend well. If she has been there for you when you needed her, you can count on her when you and your boyfriend break up. (Let's face it- even though your relationship may seem perfect, you can't predict the future.)
On the other hand, if you aren't 100% sure if you can trust her and you tell her about intimate things even then, you have to take into account that she may use them against you one day. (But remember one thing- your friend may not always be honest with you, even if you're in a toxic relationship, because after a potential break-up you could blame her for it and she also doesn't want to hurt your feelings. Obviously, the truth is better, but it's often very hard to accept.)
And last but not least, tongue kissing and Hands All Over are NOT ALLOWED. Please, for God's sake, do it somewhere else. Such situations make me feel deeply uncomfortable. And I can imagine that others feel the same way.
To sum up, I would like to recommend you two episodes of SATC- "Three's a Crowd" and "The Chicken Dance". What have they taught me? To keep away from any kind of threesomes.