First of all, the desire to reproduce and pass on our genes may be hardwired into our DNA, but none of the rest of what swingers do is. In fact, if we're going to go all scientific, it makes no sense whatsoever for a man to willingly share his wife!
Second, swingers are not "the most sexually enlighten in our society. You correctly differenciate between love and sex." Some might be, but you can't generalize like that. Some men might be forcing their wives into swinging. Some women might be seeking better lovers. Some people might have fetishes that they can't satisfy any other way. None of this requires (although it doesn't preclude) deep thought or enlightenment.
Third, if I had a child, male or female, I would make sure that child had proper basic information about sex and then I would get out of his/her way. If he/she wanted to ask me questions, fine. But there's no way I'd take a child to a party or "arrange for her to have sex"! That's child abuse.
We all have to figure out what works for us, sexually, and we have to make mistakes because sex and love are confusing. Trying to explain the 'right' way to do it to a child will never ever work.
I could have been a lot more outraged and biting, but you asked that you not be flamed. However, you need to realize that what you are suggesting is illegal for a reason, appalling (I hope) to everyone else on this board, and based on some faulty assumptions.