Homosexuality is psychological and not biological.

Thank you for your opening gambit. You said; "An evolutionary basis or incentive for homosexuality to exist is not necessary for it to be (at least partly) biological in nature." While that may be technically true, it does not prove or show that homosexuality is biological or genetically driven. And that's the crux of the debate here, is there any empirical evidence that homosexuality is biological or genetic in origin? Is there a 'gay gene'? Can the difference between a homosexual and heterosexual be measured by differences in the brain? I don't believe that there is any compelling evidence to support that it's rooted in the genetic or the biological. If there is such evidence I have yet to see it. You said; "There is a direct link between smoking/drinking and fatal conditions . Pro has provided no such evidence for a direct link between homosexual activity and higher death rates..." But that is simply not true. You've already conceded that on average the homosexual man will live at least 20years less than the heterosexual man. If it's not his homosexual activity that's the cause of this shortened life span, then what is it? Let's look at this way. If a man with homosexual thoughts never followed through on them and abstained, I would suggest very strongly that this man's lifespan would not be reduced in the way that a man with an active homosexual lifestyle will be. It's following through on the thoughts that ultimately causes the reduced average life span. Not merely the sexual activity but the far greater predisposition for drug use, the fact that one in five homosexuals who are active have HIV(and many not aware), the greater predisposition to unprotected sex, the greater predisposition to promiscuity. You said; Another distortion. Pro's link in support of this only found that to be the case in "about half of all couples" - not "almost all". It's important to note here that this is not 'another distortion' since there have been no distortions so far. At least half of homosexuals that are married concede that their marriage is entirely 'open'. That's a pretty damning % in itself, and I would suggest to you that the same % would not be reflected in heterosexual marriage. While there may be 'open' marriages among heterosexuals, I would challenge you to show us any conclusive evidence that demonstrates that the ratio is even close to half. Moreover, it is not exactly a leap of faith to propose that if around 50% of married homosexuals conceded that their marriage is open that there will be others among those asked who would not admit it. Even at 50% it demonstrates what I stated - that the homosexual life does not lend itself well to a committed relationship between two people . You said; "The validity (or lack thereof) of this argument is of absolutely no relevance to the overall debate. Pro's position is that homosexuality is only a psychological condition, and not biological - not whether or not it is/should be classified as a mental disorder/health issue. Absolutely no data has been provided to support Pro's assertion that these behaviours are caused by homosexuality itself. It's also worth mentioning that a population having higher rates of those particular behaviours isn't necessarily indicative of a mental disorder - this is commonly found amongst several populations which are definitely not collective sufferers of mental disorders (black Americans, for example)." The first paragraph of what you've written is a clear contradiction in terms. You are correct in that my position is that homosexuality is rooted in the psychological and not the biological or genetic. Thus far you have not proven my case to be wrong. You have also not shown that homosexuality is biologically driven. It would follow that if its a psychological condition then it's by very definition it would be a mental disorder/health issue. When the psychological condition of homosexuality is actualised and followed through on, it leads one into a World of higher risk of drug dependency and sexual behaviours that clearly and demonstrably are a health issue(physically), caused by them following through on their psychological issue(homosexual ideation).