Voluntary Homosexuality is Sin Elsewhere

Jude 7 is not about this. That is the first thing to say, and Heiser says it plainly - "other flesh" means angelic flesh, not same-sex practice. But people reasonably ask what Scripture says elsewhere, and Heiser has a specific answer that is not the usual one.
He works through the standard scholarly explanations for the Leviticus prohibition - that it is about idolatry, or about blurring gender boundaries, or Milgrom's argument that it wastes reproductive seed - and he does not adopt them. His own line is creation order: "doing this is contrary creation order."
And he notes where Paul lands. Romans 1 does not argue from Leviticus's legal code at all. Paul's "argument from nature is about creation order" - what male and female and sexual union were designed to be and to produce.
Scripture links:
- Leviticus 18:22 - "You shall not lie with a male as with a woman; it is an abomination."
- Romans 1:26-27 - Paul's argument, which includes both men and women, and which reasons from design rather than from the law code.
Heiser is not arguing a culture war here. He is tracing a line from creation through Leviticus to Paul.