Gays can get "married" civilly, but not in the Catholic Church.

Our nature and our body tell us things:  We were made for both union & procreation; integrated self-gift

The Chuch looks at us as wholes - integral development and gift, whereas you look at us as parts, a buffet line of dis-integrable parts. 

Marriage represents the union of Christ & the Church; total self gift, one for the other.  No picking parts. 

How can there be a union of an X and X?  Where's the complementarity/union of that?

Where's the fruit of that mimicked union?

You believe that 
- sex can be separated from marriage,
- marriage can be separated from children,
- sex can be separated from its natural effects,
- love can be separated from sex (and vice versa),
- sex can be separated from responsibility

Division, diablo.

You believe love is a feeling, not the willing sacrifice of one toward the other's good.

You believe all these things, whether you've actually articulated them or not to yourself.