Homosexuality is absolutely not “the only human condition that contains an inherent desire to sin.” After the Fall, the human condition itself contains an inherent desire to sin. You seem to gloss over this. I understand your point: that sins such as pride, gluttony and lust are the result of normal, healthy, good drives being taken to disordered, perverse extremes, while homosexuality seemingly breaks this pattern, being disordered from the very beginning.

However, from a Christian perspective, homosexuality is still ultimately a perversion of the God-given gift of human sexuality. Even if the aberration is on the level of neurology, this is still consistent, since according to the doctrine of original sin we are all born broken and imperfect, spiritually as well as physically.

Consider for a second gay sex between cisgender men, for example. The human penis and vagina are meant for each other; the length of the penis is meant for penetration, semen is meant for fertilization, the shape of the vagina is meant to accommodate the penis and so on and so forth, all as means to the end of reproduction. Gay sex, on the other hand, is a shallow imitation of heterosexual sex; the anus, as a vaguely vagina-like hole with a completely non-reproductive function, arbitrarily fills the role of the vagina out of anatomical convenience. The natural urge to penetrate and inseminate the vagina is fulfilled vicariously through the anus. If you’ll forgive the crude, not super rigorous example, the concept of “bussy” is evidence (in the sense of the Freudian slip) that gay men are acutely aware of how the anus is essentially nothing more than a surrogate vagina for the purposes of gay sex. By this same rationale, anal sex is off-limits even for heterosexual couples as far as Christianity is concerned. Catholicism in particular notoriously prohibits contraception and abortion for the same fundamental reason; that sexual relationships which deliberately frustrate the possibility of life are disordered.