The problem I have with these types of claim that anal sex causes harm is that it total ignores the similar "harm" that can be caused by vaginal sex. For example, vaginal sex raises a woman's risk of cervical cancer likely more than 4000% (as it is an STD, and this is a big enough thread we've even developed a vaccine to combat it). Yet, for some reason when people bring up the "risks" of anal sex they don't bring up the similar risks caused by vaginal sex so that we can compare the "harm". And, as for lesbians, while they have a higher percentage of things like breast cancer and ovarian cancer, the cause of this higher risk has not yet been determined -- it does not necessarily have anything to do with the type of sex they like to have. And even abstinence has risks, as men who are abstinent are at a far greater risk of prostate cancer.
It really isn't surprising to me that after presenting not one shred of evidence that there is any biological difference in homosexuals at birth, that this thread has turned into a discussion about what form of sex "harms more". Anal sex is unnatural and is not what our bodies were intended for, unless of course you don't have the option of doing what our bodies were intended for.
As far as drug abuse, alcohol, and tabacco abuse, there have been studies that indicate these are a result with the way society has treated homosexuals and nothing to do with sexual orientation. Further, recent studies have found these abuse issues are declining in younger homosexuals.
Based on what? This isn't the civil rights movement where gays have to sit in the back of the bus, so don't act like being a homosexual makes someone an oppressed "race" that has been abused for decades forcing them to turn to drug use, that's simply ridiculous. The number of crimes committed against homosexuals based purely on their sexuality pales in comparison to the violence we see as a result of racial tension every day, but using your logic you'd have to believe it if a minority told you they were driven to abuse drugs and alcohol, you know, since it was a result of their "treatment" in your view. The majority of our nation does not approve of homosexual behavior. We belief they have the right to chose this behavior, but do not agree with it. The homosexual movement defines tolerance as approval, therefore being intolerant of common disagreement regarding their lifestyle. Complete hypocrisy.
Last, the Medical Institute of Sexual Health does not seem like a non-biased source. Some of their claims (such as claiming that homosexuals "rational and moral restraint to the deleterious undertakings of those individuals have fallen") are editorial and subjective rather than based on any real science. Further, they appear at heart to be an "abstinence only" supporter, claiming that there is no benefit to condoms in lowering risk of HPV and other STDs (which is contradicts medical research).
Disagreement does not equal bias. If you posted something that supports your view, and then I find out that, shockingly, the author also supports that view, would it be fair to call it all biased? Of course not. People have view and that does not make there points illegitimate, it is to be expected.
If it is partially based on biological predispositions, then how is it dysfunctional?
False dilemma. If something is based on biological predispositions, that does not mean it cannot also be dysfunctional.
And as pointed out there really aren't that many homosexual men that speak and act like women. Even your own source, which is from 1962 (and as such, highly suspect), claims that it is no more than a third of homosexuals that act effeminate. Even if you are correct in that one third of gay men do have a gender identity confusion (which you have not come close to showing evidence for), how then is the homosexuality of the other two thirds of gays explained?
Absurd. Effeminate behavior is rampant in the male homosexual community. This is simply a baseless contention. Homosexuals literally change their behavior to fit in with their surrounding community. Watching any gay parade, protest, or speaking to homosexuals will make this clearly apparent. There is a physiological reason why so many homosexuals dress and act in ways that are different than the way that their gender traditionally does.
Again, false dilemma. Stating that one third of homosexuals have gender identity confusion does not disqualify common explanations for homosexual behavior. Furthermore, it doesn't have to and really is a separate but related fact. If you don't think homosexuals act like the opposite sex, then you are in denial and are ignoring basic observation.
Not to mention, the vast majority of crossdressers are heterosexual.
Irrelevant.