Youre comparing apples & durians. Both have their uniqueness.
One poke men's backsides (and taste the faeces), while the other poke at other men's wife (and taste her cum)
So which ADULTERY is greater? The men poking other men's wife or the wife that's wanting to be poked by other men?
homosexuality is between 2 persons of the same sex. mansexman or womansexwoman.
ADULTERY involves 4 players: a pair of adulterous man and woman and their unwary or already suspicious spouses.
for the former, it's just between 2 persons of the same sex while the latter is an illicit affair which causes hurt to many whether witingly and unwittingly.