“…that they are endowed by their Creator with certain unalienable Rights, that among these are..” 

– Declaration of Independence

…which implies that there are other unalienable rights.  A natural right is a thing that is granted to us by God only, we cannot make it, that we have a right to defend when other  infringe on it. Love is such a thing.

We do not choose to love.  Love comes from our nature, and from circumstance.  It is something essential to our well being.  When someone else tries to prevent us from acting from love for another, we have the right to defend our freedom to act.  So love is a right.

Marriage is a choice we make based on love for another.  In traditional marriage, we elect to limit the expression of our sexual love to our spouse, and to live communally with our spouse.  

The problem we run into with sexual love is that committing ourselves to just one person does not stop instinct.  Our instinct is to spread our genes around.  So we have sometimes have  difficulties when we marry because we have agreed to limit ourselves to our spouse, but our instincts tell us to seek out another lover.  In theory Religion helps address this.  Religion speaks to the irrational mind, which is the passionate mind.  The language of religion speaks to the irrational mind, and reminds it to restrain itself sexually.  It takes both the rational mind and the irrational mind to keep the instinctual mind under control.  A strong religion has traditions that can counter the instinctual mind.  Those traditions evolve over time. 

If a religion has traditions strong enough to help keep sexual instincts in check, it can help help keep the marriage together.  Of course, the main reason marriages fail is because at least one of the spouse is a jerk, period.  Religion has difficulty addressing the mindset of a jerk.

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