Two competent and consenting adults – whether man and man or woman and woman – should be allowed to erotically express their feelings for each other and even marry. So, John and Robert (or Lisa and Sophie) should smooch in public – while little impressionable boys and girls watch – because they ‘love’ each other and are ‘sexually oriented to have amorous relationships with the same sex (forget the fact John had a stable heterosexual marriage and has with his former wife several children who are spitting images of his).
No one should moralise about this, argue advocates of same-sex relationships and marriage. After all, they say, morals are a subjective creation of society. No one, but God alone, should claim the lofty seat of judgement.