I'm not sure you do know what swinging is about...if you did, you would really have had no need to ask the question you did....
That type of question comes from someone who has no idea what swinging is about. Someone who knew about swinging and the intricacies involved in such and the type of relationship required of a married couple (or non-married couple) would understand that the majority of those husbands/SO in swinging are just as cock sure of themselves and their techniques where their wives are concerned (most swinging husbands have had years to master their wife's buttons and the majority of swingers are pretty adventurous where sex is concerned, so they have tried pretty much everything under the sun ) as you seem to be about your technique, that they really would have no problem whatsoever with watching her enjoy herself. They would have no fear of her leaving him or pinning over you, just because you made her have an orgasm or two.
You forgot a major component when it comes to dealing with a couple who swings, when you asked your question...LOVE...sex is sex, sometimes it's good, sometimes not as good and there are even those times that it's earth shattering but...LOVE makes all the difference. It will always trump whatever ace you think you have up your sleeve.
Well shoot...you found us out. Even though swingers do, to a certain extent, have more open minds than the "vanilla" world, we are still just people and you're going to find smart-asses, those who are sensitive to your cause, those who are bull-shitters and those who will try to educate you on any given subject...just like everyone else in the world. Lighten up a bit dude.
Your original question came off as extremely egotistical...even if it was a bit naive...has it ever occurred to you that the single women you have tried your technique on, just hadn't had good sex before? Most swingers swing because they have GREAT sex at home, they've already dealt with the fear that they or their spouse might have better sex with someone else, to the point that it's not a concern of theirs.
Personally, your original question just cracked me up and I happen to be a huge advocate for single men in swinging. I've had hundreds of single men pose the same superior attitude and I've even sampled quite a few of them to see if they were as good as they thought they were...most were not...some were good, some were even fanfuckintastic but...none of them could trump what my husband does to/for me.
Put your fears aside..you may be good, you may be even fanfunkintastic good but if a couple has problems between themselves because you showed the wife a good time...it wasn't because of you or your techniques, they would have had problems eventually.
Teresa