Romans 1:26-27 - "Because of this, God gave them over to shameful lusts. Even their women exchanged natural relations for unnatural ones. In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their perversion - happy
And how exactly is that a prohibition? It reads to me more as a punishment, not really a prohibition. Whoever Paul is talking about did something and god laid the smackdown on them by making them go against their nature.
Thing is in your bible, your god is VERY clear about things to NOT do: "Thou shalt not steal", "Thou shalt not covet thy neighbors wife", and very clear about things you MUST do, "If a man has a stubborn and rebellious son who does not obey his father and mother and will not listen to them when they discipline him, 19 his father and mother shall take hold of him and bring him to the elders at the gate of his town. 20 They shall say to the elders, "This son of ours is stubborn and rebellious. He will not obey us. He is a profligate and a drunkard." 21 Then all the men of his town shall stone him to death."
So, where in the quote you mentioned is it made clear as a 'Thou shalt not' that lesbianism is prohibited?