There is no discrimination because a same-sex couple cannot do what a straight couple. It's not like racism, claiming a white person has greater intelligence than black people, when they are the same. Discrimination demands that the two are equal. A same-sex couple can never produce children naturally; therefore, they are not equal.
I propose that gay people are to have no rights as couples; therefore, they cannot raise children, adopt, or impregnate themselves. Any of these practices should be banned; furthermore, gay people should not have the right artificial impregnate themselves.
My argument is simple. Same-sex couples are not the same as straight couples because same-sex couples cannot have children; therefore, they have no rights to raise children, marriage, or benefits. There is no discrimination because the couples are not equal. I believe in that which is natural.