This really happens.

Imagine if two gay brothers fell in love and had a sexual relationship!

Oh wait, you don't have to imagine.

http://www.salon.com/2010/05/21/twincest/

Truth is stranger than fiction.

I mean IF the 2 siblings in question happen to be consenting adults who consent to the relationship then he does have a point - who are we to judge? I don't think I'd want to watch a movie about it although technically I have read a book about it (the 'Flowers in the Attic' series which was the 'Twilight' of my generation).

To me, I guess I see incest where an adult forces sexual relations on a minor who is either their child or some other relative. And for anyone lurking - this is something I am 100% against and I'm sure all DUers would agree. What Cassavetes is describing does not seem like incest to me.

But who are we to judge if 2 consenting adult siblings want a relationship?

I would remain judgmental. I don't think two people can develop properly if there are lines crossed between parent and child, or brother and sister. For one thing, if they ever do develop "normal" relationships, that's a hell of a lot to ask someone to accept from the family.

Definition:

1) Sexual relations between people classed as being too closely related to marry each other.
2) The crime of having sexual intercourse with a parent), child, sibling, or grandchild.

Ok first this isn't for you but anyone reading this - THIS IS ABOUT CONSENTING ADULTS ONLY!!!

I don't want anyone even remotely suggest I (or anyone here at DU) condone Adult/child relationship.

Yes it would be alot of ask someone to accept from the family but the same could be said with same sex relationships or even interracial relationships. I remember when a girl who went to HS with me married an african-american. This was about 5 years after graduation and it was a shock for everyone. And people talked about her 'poor family' and how they suffered so much for the 'heartache & embarassment' she caused them (mind you this was about 25 years ago and I grew up in very rural PA). I had run into her about 3 years after her marriage and we talked alot about it, she was so happy in love and had so much pride about her kids. Isn't being in a loving relationship what it's all about?

I'm not suggesting we should all go out and have sex with our siblings, honestly the thought does seem icky to me. I'm just saying that if I met a couple and they said they were in love and they were siblings (and both consenting adults), who would I be to judge them. I guess to me I don't understand love and how it works so if 2 people are in love AND consenting adults, then who am I to judge about the details.

In some ways I think they added definition #1 just to discourage interfamily relationships because there was a threat of recessive genetic disease expressing themselves if too many relatives married. That was one of the reasons for Hemophilia and Web-fingers being rampent in European royal families centuries ago. But if I'm correct those things can be test for before a couple has children.

And my late grandparents, married almost 60 years were 1st cousins once-removed. So I'm probably the last person to judge on this subject matter. Which yes, means I am my own 3rd cousin once-removed.

Consenting adults, folks. It really is that simple.

of which I am, assuming we are discussing adults and not parent/grandparent - child type incest. If the objection is to the genetic problems more likely in offspring, then the objection would be to having children together, not necessarily having sexual relations. Also, if that is the objection, then same sex siblings would/should not be a concern.

Even though I still think it is wrong, I find it hard to explain why, given that I believe in the right of consenting adults to have whatever sexual relationships they wish.

against his wife who performed live sex shows with her twin. The photos were creepy as hell. The guy won!

or was it because she was doing it with her twin?

their performances were for biker parties with audience participation.

across the US, I don't think a plaque of Brother/Sister romances will spring up. Relationships with anybody else would seem preferable to most people, realistically, particularly in regard to having kids. Still a cringe-worthy topic though, yes?

Ha ha, made you click!

It doesn't matter what species, genetic diversity is essential for survival.

really ICK for me, but as others have pointed out, if it's between consenting adults, then who am I to judge?

It's funny...two years ago I learned that one of my stepbrothers (my mom's late second husband's son) had a "thing" for me years and years ago. I thought he was sort of cute, but didn't know he had a bit of a crush.

When I saw him last year at my brother's wake, I sort of got all flustered and uncomfortable with the knowledge of his feelings, which I'm really glad he never expressed all that time ago (our parents married in 1972 and his dad died in 1990...we were both late teens).

But anyway, I guess my point is that even though we didn't live together as brother and sister (I was married at 19) there was still, in my mind, that boundary of step brother and step sister.

But hey...I guess people can do whatever makes them happy as long as nobody else gets hurt.

(between blood relatives, not steps) produces a child with birth defects.

Society might deem that child abuse.

Personally, I think the royal family proves my case.