Well the pursuit of Happiness is in the Declaration of Independence.
If a penis is involved in any way, the law must affirm. You're not seeing half the interest in free love for nuns, same-sex marriage for women, or lesbian priests -- they don't have the right sexual equipment to interest the lawmakers.
If the day ever comes when both church and state can stop their obsessive focus on the penis, perhaps we will go back to getting some actual work done in the world.