Okay..now we're getting somewhere.
David here.... Personally, I don't think it's ever to early to broach this subject. I made it very clear to my fiancee (Maggie) after the first date, as to what I was about.
Her first reaction was confusion. But she accepted it at face value, since we were only dating and I never asked her to swing with me. She fully participates in the lifestyle now, by her own choice.
I think it's a complete waste of time to lie/deceive/hold back your true nature. Especially in a dating situation. The end goal of the dating/mating ritual, is to find someone you are willing to spend the rest of your life with. At least for most of us it is.
If a person FREAKS when you come out later. Then you wasted a part of your life, that you can never get back. And life is way to short to waste even one day!