Threesomes - a PlayBook (explicit)
DISCLAIMER: I do NOT think that poly=group sex. I DO think that when people actually consider ALL of their options, they may decide that they like some of them and don't like others...and that is OKAY. Despite the fact that I am polyamourous, bisexual and enjoy group sex - I actually don't consider myself "kinky" (which my boys find hilarious). "Kinky" to me means serious BDSM stuff - I like "regular" (i.e. vanilla) stuff - just with more than one gender, and more than one person, and sometimes with more than one person at the same time
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As usual, this post is inspired by my temptation to write a virtual book in reply to a post. It was suggested that - in the stereotypical scenario of couple = straight guy and bisexual gal - a threesome would be a good way to "ease into" poly. In a word: NO.
IMO - When someone is feeling insecure and sexually-unwanted is a BAD time to try a threesome - any attention that the other person gets is going to get blown WAY out of proportion and someone is bound to feel left out. Group sex should take place in the setting of a.) "and a good time was had by all", no expectations, no worries - the way I imagine swingers approach it, b.) a loving network where everyone is already confident in their relationship and only wants the other(s) to have a good experience.
To be fair, my first intimate encounters with MrS were threesomes with him and his ex-girlfriend (ex- at the time of the encounters, not because of them). BUT - a.) I had no horse in the race other than a sexual thrill with friends and b.) SHE was already comfortable with threesomes although it was my first, and had the sexual confidence to pull it off gracefully.
So, over the past 28 years I have participated in several flavors of three-or-more-somes. Surprisingly, almost all have gone really, REALLY well. (And the others went fine, just no awards - never actually had a bad experience.)
First flavor: BiF-M-BiF - love this one

- as one of the F's you get the best of both worlds, some of everything to your taste - furry chest, boobies, penetration, cunnilingus. Key to making this one fly - it's NOT about the M "satisfying" and "paying equal attention to" both women - he can't, he's not equipped. Instead, it's the Women ganging up on the Male, letting him watch them enjoy EACH OTHER, and teasing and torturing him until THEY decide how to "use" him for their pleasure.

(sub-flavor - one or both of the F's are straight - but want to "put on a show" for the guy - but still collaboration, NOT competition, is the key)
Second flavor: StraightM-F-StraightM - this one takes a fair amount of confidence on the part of the Ms - but I get ALL the attention, so who is gonna complain? Sometimes they divide me Left/Right, sometimes Up/Down, sometimes I am so turned around I don't know who is where
Third flavor: (which is actually the one that I have the most experience with) BiF-BiF-M - this is different than the first in that the attention is directed to a "guest" to our bed (so, one of my boys and me with a woman - either a friend or a girlfriend - also referred to as "Lady's Choice" as in the Lady (guest) can request who she would like to escort her to bed). Look, I get to sleep with my boys anytime we are in the mood. VV (or Lotus or whomever) only visits occasionally - so we, as hosts, should show them a good time, right? This DOES set up a bit of competition - but the good kind, as in, who can make her moan louder

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Fourth flavor: verging on orgy - Me, BiF, both of my boys +/- anyone else around - find a tasty bit to nuzzle and start wiggling. Every so often someone yells "switch" and you rearrange your parts. I like BiF/BiF/M/M for this - you can do M/F partners and switch and then morph into a M-BiF-BiF-M chain. This definitely is more on the "recreational sex" end (as opposed to "DeepBondingEmotionalShit") but it helps if you all actually like each other, care about everyone having a good time, and don't have anything to prove.
Other flavors: I have been involved with group sex with all Females on occasion - one time it was 3 BiF (but MrS was present and appreciating), one time it was 3 BiF but one excused herself during foreplay because her boyfriend "would get mad" (the other one stayed and we had a good 1:1 evening

, one time it was 3 BiF but I FELL ASLEEP so they pushed me aside and had at it

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Then, there are all the variations you can think of in between - think soft porn group sex foreplay and then people peel off for the actual sex with partners of their choice. Oh, and did I tell you about the time that I took MrS, Dude AND MrClean to a strip club and then got a private lap dance?...