Marriage

I really don't understand the reasoning behind people banning gay marriage.
I try really hard to listen to others point of view and try to understand their beliefs, but I just don't get it.

Dooooonnnn't get it.

Here are the rules of marriage in my book.

You must...
A-Be in love.
B-Be 18 or older.
C-Can only have 1 spouse at a time.
D-Must not be related.

That's all. Those are the only rules.
That prevents all problems.
All is well.
The end.