Friends with 3-way benefits

I'm looking for a couple where we can become friends before moving on to get to know the wife more intimately. He might want to watch and occasionally join in, but his enjoyment is from the erotic vision of his wife 'letting go' with another man.

Of course there has to be mutual attraction, and I'm looking for scrupulously clean, polite, discrete and D&D free people. My preference is for 'slim/medium', I won't meet smokers, and not into piercings or tattoos unless they are subtle and hard to find!  NSA and safe sex only - and nothing 'extreme'.