So they can marry and if they feel the need to be with a person of the same sex then they can go do that also.
No right has been taken away from a gay.
Your statements could easily be reformulated as follows:
Marriage is already open to miscegenists. They have the same right to marry a person of the same race as you or I do.
So they can marry and if they feel the need to be with a person of a different race then they can go do that also.
No right has been taken away from a miscegenist.
Have they found the gene yet that makes one gay?