This position can be extremely intimate because it has a nurturing element. The woman behind the man holds his head, wipes off his sweat, and kissing him, while the other woman sends dopamine through his body by sitting on his dick. The intimacy between the man who has his head resting on the woman behind him works both ways. From giving him the feeling of a nurturing mother behind him, to her being able to hold the man in her arms while he gets pleased by the other woman. You can use this Head Rest position whether having a woman ride the man or having her give him a blow job.
Difficulty Level
Beginner: Basic threesome position
Pros & Cons
+ Nurturing and intimacy
+ The ability to whisper in his ear the entire time
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This is a great position for all types of intercourse. Doggy with one partner, switch to missionary with the other, or doggy with one partner while the girl in the middle can wear a strap on and penetrate the girl under her. 
Difficulty Level
One of our favorite positions, In almost all of our experiences we end up in this position at some point. This is a great position to spoil one of the women. The penis in her mouth helps turn her on (especially for those that have a dick sucking fetish), while being ate out allows her to easily climax. Remember, either partner can take either position, especially if the woman being spoiled wants taste a vagina while she has the man go down on her.
The Fidget spinner is kind of like the human centipede except fun. This position can be a gay all male threesome, a bisexual mmf threesome, or a bisexual ffm threesome. This position can be fun if you can coordinate your orgasms and all climax at the same time. 
The Scales of Suckthis, I mean Justice. During a FFM threesome this position can be intimate as you can three way kiss while keeping your hands busy.