You feel secure in your relationship. When you look at your partner, you don't get the feeling that he's going to leave you. You don't worry about cheating or a lack of commitment. You feel comfortable and you know that he's your main squeeze. And, you don't feel jealous around him because you know that, at the end of the day, he's coming home with you. The feeling goes both ways, too. If you can't say that, don't try to have a threesome. You won't be able to handle seeing him with someone else.
You're not being pressured into it. The biggest sign that a couple won't survive a threesome is when one partner won't stop begging, pleading, and pressuring the other for one. If one person clearly is not into the idea and the other keeps pressing, you shouldn't have a threesome…or even a relationship with this person. On the other hand, if you're both down, it's a good sign.
Things aren't tense at home. The worst mistake that a person can make is to have a threesome thinking it'll fix things. It won't. It will complicate any issues that you may have with your partner at the current time, and it'll make them feel like it was a sex act with strings attached. You're only ready if you two are pretty steady together.
You know each other well enough to know when something is wrong. There have been many threesomes gone wrong because one partner realized, during the threesome, that the third in the act was having a longterm affair with their partner. Other relationships dissolved because one partner felt neglected during the threeway. You need to be able to figure out if something's up
You've discussed birth control. Never have a threesome unless safe sex is discussed and practiced. Otherwise, this can lead to an unplanned pregnancy…with the wrong person. It has happened before. Don't let it happen to you.
You've learned how to talk things out rather than argue, stonewall, or whine. Good communication is crucial to a threesome
You've both had experiences in the past, and know how you deal. If you're both experienced in threesomes, then you know how you deal with any emotional baggage that can come with them. This is a good sign that you know when you're ready
You've stopped a sex act mid-act because of a safe word. Here's the thing about threesomes: they still need to be safe, sane, and consensual for ALL THREE PARTIES. If you're telling a guy to stop and he won't stop, you need to dump him immediately and toss the idea of a threesome out the window. If he's stopped sex because a safe word was called, it's a good sign that he'll stop during a threesome and be respectful of you.
You can agree
You're both sane. Threesomes and emotional instability do not mix. If you know you're prone to emotional outbursts, borderline personality disorder, violent arguments, and insane jealousy, you will not fare well
You agree
There's an understanding of what happens if ground rules are broken. If your partner or you ignore the safe word and the ground rules, you need to lay down what will happen
You both respect one another. Without respect, there's not going to be much good to come from a threesome. If anything, a threesome where partners regularly disrespect one another is closer to cheating and humiliation than it is an actual threesome. Also, disrespecting one another will make the third partner feel really uncomfortable - and that's a big "
You have established
You feel
SOURCE:therebelcircus.com