If the 3rd wheel vibrates, well......

Why a third wheel ?

The third wheel is the person who feels left out, so I doubt anyone is jealous of them.

However, if someone does feel left out, then you aren't doing a threesome correctly. All three parties should want to participate with the other two, not the typical porn fantasy scenario of two people paying obsessive attention to the pleasure of the third.

Whether a brief sexual interlude, or a long-term relationship, as @Julie808 explained, a threesome requires honesty and genuine communication about expectations. I guess it's similar to any other relationship dynamic that way.

I don't know the answer to your question, since it's unclear who the "third wheel" would be, aren't they all the "third" depending on the perspective? All I can say is that it seems from what I've learned so far, is that honesty and genuine communication must be the key. Secrecy and lack of communication would be the enemy of such a relationship, if it were to be ongoing and a permanent fixture in the triad's life.

I'm interested in hearing the answers here since, as an officiant, I have another commitment ceremony coming up for a threesome. so the more I understand about the challenges and rewards of a triad type relationship, the better.

In the only other threesome I helped with a commitment ceremony, it was the male who was jealous of his wife falling in love with another woman, but they handled that by adding the third, rather than dissolving the marriage. It wasn't that the marriage was injured by the third party, but ended up being enhanced.

I'll be curious to hear the story of the next one I have coming up.

I had a threesome (two women and one man) and never felt competitive nor jealous.

We had lots of fun all night long. I lived in the top floor of a house above my landlord. The next day he raised my rent $50 and told me to "keep the noise down."

The landlord was the only person who felt jealous.

Why the hell you asking me?