Many people have this idea that they want to be able to tell their parents anything and everything. Some feel that they already do. If you already tell your parents everything, then there is nothing to come out about. You already told them.
If you haven't, the question is: should you? Do they need to know? If you are gay, that is something that they probably need to know. If they expect you to come home for Christmas with Eve and you bring Steve instead, they are probably going to figure out that something non-traditional is going on.
However, what about being poly or kinky? Let us address each question separately.
For many in the kink scene, it is more than a sexual proclivity, it is a community and a lifestyle. You may go to munches and have many friends you met through the scene. Your main hobbies may be scene related like rope or building rigging equipment. Obviously, the judgment of whether you should or should not come out is entirely up to you, but consider this question, does any part of this lifestyle affect your family at all. If you are only kinky in the bedroom, I would suggest that there is no reason for your family to know. You don't know what your family does in their bedrooms and you are likely happier for the lack of knowledge. Why would they what to know what you do with a rubber chicken suit and a seventy feet of silk rope in your private time? Of course, if your full time profession is making sex toys it might be good to let them in on the secret. Otherwise, simple conversations like, "how's work going, honey?" could get quite awkward.
When it comes to coming out as poly, it is a similar issue. Do they need to know? Does it affect them? This would largely depend on the nature of the polyamory that you practice. If you have a primary and a few friends with benefits, this probably falls into the kind of behind closed bedroom doors information that you family does not want to know. On the other hand, if you have two primaries who are both equally important, then you might want to explain ahead of time why you are bringing both Eve and Steve home for Christmas.
Should you decide that coming out is the right choice for you and your family, I offer two pieces of advice. Don't make it a bigger deal than it really is, and find common ground.
When I say not to make it a bigger deal than it really is, I mean that if you don't make a big deal of it, they may not either. Don't preface your explanation something like this, "Mom, Dad, I need to tell you something and I'm not sure how you'll react. I know that you always raised me to be a moral and proper person, and I hope that you approve of what I'm about to tell you but I'm not sure if you will..." That's how you introduce a confession of guilt. You should not be guilty about your lifestyle, and, if you are, you should get straight with your own morality before you go dragging your family into it. Rather, introduce the concept with confidence. If you act like there's nothing wrong with it, no one else will have a reason to think so either.
Second, find a way to explain the concept so that others can understand it. You're not coming out as a martian. We all have the same psychological needs, and we all fulfill them in similar ways. Your way might just be slightly less common than theirs. Also, it is important to understand that your family may have difficulty understanding exactly what you are saying. They may have pre-existing notions from television or other media which may be completely inaccurate to your situation. Understand that their questions are likely not meant as judgments, just as a way to gain better understanding. Unless your parents are quite disturbed, they probably have your best interests in mind and want to make sure that you are making right choices to be safe and happy.
Candy Says: I once had a very interesting discussion with a friend's grandfather about bisexuality. He asked all kinds of questions. Turns out he had no problem with homosexuality but he only knew gay and straight and was confused by bisexuality. He asked, "How do you decide which one you are? Do you flip a coin every morning?" It wasn't meant to be offensive at all. It was just the best question he could think of with the background he had.
Let's also remember that if you haven't come out to them, they haven't come out to you. For all you know, you might not be the only poly or kinky person in your family. Wouldn't it be a kick if you came out and some family member said "yeah, me too."
Whether you are out to your family, completely closeted, or about to come out this weekend, I wish you the very best holiday.