As for me, I'm in an beautifully honest, open relationship with someone (Daring2Explore) who makes me happy and we have a wonderfully chaotic, blended family together. We give each other the freedom to explore our happiness with others - emotionally, intellectually, and sexually - but it takes a special kind of person to accept our existing relationship without judgment. I'd be more than happy to discuss my philosophy on relationships and what polyamory and responsible non-monogamy means to me, but I understand if it's not for you and I have no desire spending more time explaining myself than getting to know you better.
I'm very explorative and have a lot of experience with alternative lifestyles but I'm not particularly interested in one-night stands or strictly casual relationships. I'm not opposed to a "friends with benefits" situation, but I would much prefer an intimate friend who is comfortable exploring with me or even hanging out with me and my partner socially. I'm not ruling out a more significant relationship if the chemistry is right (yes it is possible), but I have no expectations or hangups about what kind of relationship is right. If it feels good and it harms none, I'm willing to explore. I am passionate about the people who are important to me and I hope you are the same.
For the cynics out there I suppose I have to say this: Yes, she knows. We keep no secrets from each other and I encourage her to seek out relationships of her own. She'll most likely invite you over for dinner with the family if things develop that way between us (she's an excellent cook). While I'm looking for someone to date me, we're not expecting you to jump into bed with us. We don't really have the time for swinging, although we don't judge those that do.
If you're a fearless explorer and understand that relationships are more than the tiny boxes in which we contain them, I'd love to talk to you.