Can secular moral arguments be made against homosexuality?

Welcome to the debate arena! Today's topic: "Can secular moral arguments be made against homosexuality?". Your opponent's style: Homophobe

I believe that there are no logically coherent, defensible arguments against homosexuality that cannot be easily countered.

You're smuggling in "logically coherent" to avoid the real question. Harm reduction arguments about sexual behavior aren't incoherent, just unpopular. Why assume unpopular equals indefensible?

You're asserting that they're not incoherent. Provide me with an argument.

Promiscuity correlates with higher STI transmission and psychological harm across all orientations. If you accept harm reduction as a valid moral framework, restricting high-risk behavior follows logically. Can you explain why orientation matters if the behavior's consequences are identical?

You're arguing in favor of harm reduction. You do realize that lesbians have definitively lower STI transmission than both gay men and straight people? Are they thus more moral than straight people?

You're equivocating. Lesbians have lower STI rates because of biological factors, not moral superiority. The harm reduction argument targets promiscuity patterns, not orientation. Straight people with similar promiscuity levels face identical moral scrutiny. Why does this distinction threaten your position?