An interesting piece on current trends on scholarly analysis of Romans 1:26-27
"Some scholarship of late, of which Porter’s article is the most thorough example, has noted that Romans 1:18-32 does not represent Paul’s view, but the prevailing view of Gentiles among many Jews at the time, which this apostle to the Gentiles feels compelled to refute. Building off of the scholarship of J.C. O’Neill (who calls it “a traditional tract which belongs essentially to the missionary literature of Hellenistic Judaism”) and E.P. Sanders (who explains that “Paul takes over to an unusual degree homiletical material from Diaspora Judaism”), Porter ultimately concludes that “in 2:1-16, as well as through Romans as a whole, Paul, as part of his Gentile mission, challenges, argues against, and refutes both the content of the discourse and the practice of using such discourses. If that is the case then the ideas in Rom. 1.18-32 are not Paul’s. They are ideas which obstruct Paul’s Gentile mission theology and practice.”
In Short – the Ideas in 1:26-27 – are ideas that Romans is being written by Paul specifically to warn Christians from holding.
Edit – somehow I lost the link to the article – sorry !