Jan again goes to the sin issue. God is very clearly stating, through Paul, that men having sex with men, and women having sex with women, is a sin. What's more, this chapter builds towards the chapter's end, listing sins greater and greater in magnitude. These passages are at the end of this sin list, possibly using it as an ultimate sin. Yet sin is still sin, separate from a sinless God.
Romans discusses sin, as the verses following verse twenty-seven start spelling out consequences.
Nowhere in the Bible does monogamous homosexuality get described as sinless. In fact, one could argue that the Bible argues more against monogamy, based on the societal views of polygamy of the time. Also, he possibly did not have the insight or experience to know that there are people on this earth for whom homosexuality is natural and that it can exist in a monogamous, loving relationship. There are two problems with this argument. The first is that Sexuality.org seems to be implying that the homosexuals of Paul's day did not love each other, or remain faithful to one partner.