[quote=@Voltus_Ventus]
So, as we all know, the U.S. Supreme Court recently legalized homosexual marriage nation wide. So a thought came to me, if two males or two females are allowed to get married on the basis of rights and equality, why can't say, a brother and a sister get married (hypothetical, I'm not into that stuff)? Aren't they equal too? Don't they have the right to get married because they love each other? 

I'm not here to criticize or draw lines in the sand or anything, sorry if I'm insulting you but it's not my intention, it's an honest question with no malice behind it. 
[/quote]

If you want to fuck your sister/brother, go ahead and move to a state/country that allows it. Plus, like the others said there's issues with a brother and sister have sex. Tons of issues that you don't want to deal with. 

Homosexual couples don't have any issues and they are just like any other couple out there. Didn't you learn about the risks of having sex with your sister/brother in school or somewhere else?