Marriage was created by God for man and woman. If you do not have a woman to marry, you don't need to get married. Marriage is a union between man and wife to procreate. To make children. It's not just about "being together". It's a union God created.
He clearly states that anyone who has anal sex is an abomination. It makes him sick. It is called Sodomy. Those who practice it are called sodomists.