Women exchanging natural relations (i.e., procreative sexual acts) for those that are contrary to nature (i.e., non-procreative sexual acts) most certainly was intended to mean anal heterosexual sex with men, not sexual relations between two women. Up through the fourth century, church fathers who commented on Romans 1:26 understood Paul in this way. Not referring to lesbianism, but referring to men and women having sex in unnatural ways (that is, non-procreative sexual intercourse).
