Sins are actions, not dispositions. Homosexuality is a disposition.
Homosexuality is an affective disorder, a “cross in wiring” as it were where certain feelings are directed exclusively in directions that are contrary to human flourishing. “Same sex attraction” is a broader term, and I think quite a few people experience same-sex attraction at times in their lives without there being any “wires crossed”, or without having any particular “disposition” toward it. There’s a taboo on people discussing their own experiences of same-sex attraction. Sometimes people who very aggressively attack the disposition of homosexuality (as opposed to the sin) are afraid of homosexuality, as if it is a virus that someone might catch. It’s not like that.