Themes
See also: Homosexuality and psychology#Declassification
This particular charge dates back to Plato, who argued in the Laws I 636c and VIII 841d that homosexual sex was "against nature" (para phusin). This argument was echoed in the writings of Paul of Tarsus, in a claim to the same effect in the Epistle to the Romans. In recent times the discussion has been framed in psychiatric rather than philosophical terms, with the claim that it is a sexual perversion.
Though the psychiatric establishment once medicalized same-sex desire, homosexuality was later removed as a mental disorder from the Diagnostic and Statistical Manual of Mental Disorders (DSM) because the diagnosis of homosexuality as mental illness stigmatized homosexuals. There has been significant controversy over this DSM argument.

Declaration that same-sex desire is unnatural

Main article: Religion and homosexuality Blame for Biblical plagues and natural disasters
See also: Gay rights counter-movement
This is an accusation which predates the current era, as it was leveled against pederasts even during Antiquity. More recently, this charge has been phrased as "homosexual recruitment", implying that homosexuals are somehow predatory toward children, or are "recruiting" in secret. A common slogan is "Homosexuals cannot reproduce — so they must recruit" or its variants. One such example of a similar charge and its underlying argument, offered by the Family Research Council can be found here.
In The Advocate's website, advocate.com, interview on his 2000 work, Outlaw Representation: Censorship and Homosexuality in 20th-Century American Art, Richard Meyer discusses this line of attack:
..those who attacked Mapplethorpe's work in the late 1980s used this photograph to reinforce long-standing stereotypes of gay men as pedophiles. Although no sexual activity is shown (or even suggested) in the portrait, and although the picture was commissioned by the child's mother who was in the room at the time of its taking, the very fact that Mapplethorpe had photographed a naked boy was enough, at least in the minds of Pat Robertson and Jesse Helms, for the photographer to be accused of child molestation.
Current studies contradict the idea that homosexuals are pedophiles. Both national organizations for psychiatry and psychology and the FBI have concluded that 98 percent of all pedophiles are heterosexual men and that the remaining two percent of pedophiles include women and not just homosexuals. Child molestors arrested who were members of the North American Man/Boy Love Association (NAMBLA), have been married men predominantly with children who identified as heterosexual.

Conflation with child abuse
This argument has been phrased since antiquity in agricultural terms, as "casting one's seed on sterile rocks."

Dissipation of vital force

Main article: Gender identity Association with effeminacy in men, and masculinity in women

Main article: Religion and homosexuality AIDS as a gay disease

Pro-gay slogans and symbols
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Homosexuality and morality
List of gay-related topics
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Fred Phelps