If society confers the same benefits on homosexual couples, it ipso facto eliminates such motivations to form stable, childrearing families. In that case, it might as well eliminate the benefits for all couples, since there is no longer the desired motivational effect. Thus, in the long run, legitimate married couples could be deprived of such benefits.
So if I understand your message correctly, you and your spouse make your personal intimacy decisions based upon what happens to same-sex couples?
Your libido is diminished when you read or hear about "benefits" being granted to "homosexual couples" and your "motivation" to have children is reduced because, in your private moments of passion with your spouse, you whisper to each other about gay lifestyle as you are copulating---and that reduces your motivation?
In addition to "no fault" divorce, the acceptance of "free love"...unmarried women having children, couples having children without the benefit of marriage has had detrimental effects on our society as well. IMO