Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
The source of confusion in such matters is due to the two contrasting or contradictory world views. Those who consider man as the center of all things and do not recognize the role of revelation in ethics and morals would consider everything relative.
The Islamic world view is different. It has firm laws as to what is lawful and what is unlawful. The Quran makes it abundantly clear that God created males and females, and the marriage partnership is only between them and not between man and man or woman and woman.
While narrating the story of the people of Lot, the Quran says: “’Must you lust after men, leaving the wives that God created as spouses for you?” (Quran: 26:165-166).
So, there is no room in Islam for sanctioning marriages between man and man and woman and woman.
To argue against this by using so-called scientific theories cannot be acceptable, for science in Islam is not the source of ethics and values. God knows His creation better, and He has revealed laws that are ultimately good for humankind.
Having said this, we cannot enforce our values and morals on those who do not share such a world view. People are free to believe or disbelieve, and each person will stand before God for the final reckoning.
Almighty Allah knows best.
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