"...the men abandoned the natural function of the woman and burned in their desire toward one another, men with men committing indecent acts and receiving in their own persons the due penalty of their error."
Can't get much clearer than that.
However, I disagree with the assertion that "To call any part of the Bible obscure is blasphemous."
You'll have to bring up St. Peter on charges of blasphemy, then, because he said (2 Peter 3:16) that some of Paul' letters are hard to understand. He says also (2 Peter 1:20) "Know[ing] this first, that no prophecy of Scripture is of any private interpretation."
So we know this from Scripture itself, that Scripture is sometimes difficult to understand, and was not written for private interpretation.
That's why we have the Church: to give us the foundation we need to understand the truth.