Marriage is between a man and a woman. It is not between a man and a man, a woman and a woman, a woman and an animal or tree or sword or portrait.
Homosexuality is a perversion. Lesbianism is not alternative sexuality. Homosexuality can not be decriminalized on the ground that consenting adults to it. In that case consumption and trading of heroin, LSD, marijuana has to be decriminalized.
If some countries have legalized gay marriages they have gone wrong. They are on the path of destruction.
If women who enter into a lesbian union and call it marriage are shunned by their families it is understable.