Elizabeth Clare Prophet's group: Universal Church Triumphant, or SummitLightHouse.org has excellent information on Twin Flames and Soulmates. Unfortunately it looks like they have become money hungy,.. I'm not seeing the info on the web any longer.
I can tell you from my own experience.
I feel that I have met my soulmate, twin flame, and kindred spirit and star seed. I was able to talk all night to her about all kinds of topics. And we were able to also talk about topics of a sexual nature without having to feel like we had sexual feelings for each other, which we didn't, it was plutonic.
I also have had very deep bonds with my wife,.. however,. I think the soulmate, twin flame, kindred spirit and star seed goes beyond that.
As time has progressed I've spoken with my twin flame/soulmate, etc, less and less. We met of all places on the facebook. But we are still good friends.