OK. You agree that homosexual activities for non-homosexual-born person is a perversion. OK.
How do we determine whether a person is a born homosexual?
From a limited understanding that I have on the topic (only what I read here and there), there is no homosexual gene.
Also, here is a site (it was in My Favorites for some time) which kind of balances the topic.
NARTH Position Statements
7. On the Causes of Homosexuality
NARTH agrees with the American Psychological Association that "biological, psychological and social factors" shape sexual identity at an early age for most people.
But the difference is one of emphasis. We place more emphasis on the psychological (family, peer and social) influences, while the American Psychological Association emphasizes biological influences--and has shown no interest in (indeed, a hostility toward) investigating those same psychological and social influences.
There is no such thing as a "gay gene" and there is no evidence to support the idea that homosexuality is simply genetic. However, biological influences may indeed influence some people toward homosexuality; recent studies point to prenatal-hormonal influences, especially in men, that result in a low-masculinized brain; also, there may be genetic factors in some people -- both of which would affect gender identity, and therefore sexual orientation. But none of these factors mean that homosexuality is normal and a part of human design, or that it is inevitable in such people, or that it is unchangeable. Numerous examples exist of people who have successfully modified their sexual behavior, identity, and arousal or fantasies.
Do you think they have a point?
Look through the site.
These are psychologist-type people that are apparently saying things they know about.
Thanks,

Ed