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What is the biblical argument that homosexual *attraction* is sinful (as opposed to just lust)

When talking about homosexuality, discussions seem to get a little fuzzy because the word "homosexuality" can take on a lot of different meanings. Here are a few:

  1. The attraction
  2. Acting on the attraction (including non-physical actions, such as lust)
  3. A lifestyle

As far as I know, it is a widespread belief in Western Christian traditions that (2) and (3) above are classified as a type of sexual immorality, and are therefore sinful. However, I have occasionally encountered Christians from a more fundamentalist background who not only consider (2) and (3) to be sinful, but would go as far as to say that (1) is sinful.

From a fundamentalist point of view, why is (1) above considered sinful? What is their biblical basis or argument for this belief? If so, does that mean that vows of celibacy are seen as more of a "band-aid" than a complete solution?