I believe that it is unnatural.I am a Christian and try to adhere to the Laws of God.Even from a non religious standpoint one can see that it is not natural.If a man and another man try to procreate,they cannot.If a woman and another woman try to procreate ,they cannot.Only a man and a woman can procreate naturally.It takes a man and woman to create life naturally.
A lot is at stake in Romans 1: 26-27.
So, what was given up for "natural" (physiken)? "Unnatural"(para physin) or "what is by nature." What was the nature of men at that time? Men to have sex with men was natural when Paul wrote this verse. Paul's point here is that Christ was neutral about human sexuality.
In every usage of the word "atimia" Paul is not referring to moral judgement. When Paul refers to "degrading" passions, he is not referring to what is wrong but what does not have social approval.
Verse 27 uses the word "aschemosyne" translated shameless and means "not according to form." So what Paul is saying is that it is not appropriate.
There is a separation between verses 24-27(sexual matters) and verses 28-32(list of evils.) Paul was really writing about two different things. Speaking about things that were unconventional and things that were wrong.
Verse 31,32 wraps Paul's message up saying:
But what was it that Paul was talking about? I refer to footnotes:
1,18-32:The conversion of the Gentiles through the gospel preaching constituted the divine indictment against paganism, which error had benighted and moral depravity had corrupted. It was the evil will of the pagan world that provoked the divine anger and abandonment (v18). Contrary to nature itself which provides evidence of God's existence, power, and divinity through creation(19f), pagan society misread the evidence, fashioned gods of its own that could not exert any moral restraint, and indulged its perverse desires through every kind of wickedness(21-32; cf Wis 13, 1-14, 31). NAB1970.
So, what Paul was referring to was pagan idol worship just as it was in Leviticus.
Quotes and ideas above were taken from Daniel A. Helminiak's book, What the Bible Really Says About Homosexuality. And yes he was a priest in the Catholic Church and he is homosexual.
Oh ya, by the way, a woman can bear a child without man's sperm. I not so interested in how bearing children has to do with what is natural or unnatural concerning homosexuality. But I will say that, bearing children is not what Paul was talking about.
What becomes apparent to me regarding modern versions of the Bible identifying homosexuality as a sin, is that those versions are way off course, straying from the context of the epistle. Translations become interpretations that are unfounded. The above discussion is just one case in point.