Romans 1:26-27 reads:
For this reason God gave them over to dishonorable passions. For their women exchanged the natural sexual relations for unnatural ones, and likewise the men also abandoned natural relations with women and were inflamed in their passions for one another. Men committed shameless acts with men and received in themselves the due penalty for their error. (NET)
This text seems to focus on the passion and lust aspect, therefore implying that the focus of the issue is getting carried away in passion. Furthermore, I am interested in the plurality and numerology of the Greek. Does this text have anything which indicates whether this is referring to orgies.
In short, exactly what does "natural relations" mean here?