I think homosexuality, fornication, and even lust is wrong.
What about homosexuality makes it wrong? Is it just wrong arbitrarily for the same reason that it is wrong to wear wool with linen? Or plaid with stripes? Or to wear white after Labor Day?
According the Bible, sin is not arbitrary. All law is based on the following formula:
"So in everything, do to others as you would have them do to you, for this sums up the Law and the Prophets." -Matt 7:12
You can apply this rule to anything and immediately determine whether it is a sin or not.
"Do I want that person to steal from me? No I don't. Therefore it is a sin for me to steal from them."
"Do I want that person to murder me? No I don't. Therefore it is a sin for me to murder them."
"Do I want that person to bear false witness against me? No I don't. Therefore it is a sin for me to bear false witness against them."
"Do I want my mother and father to honor me? Yes I do. Therefore it is a sin for me not to honor them."
"Do I want my wife to commit adultery against me? No I don't. Therefore it is a sin for me to commit adultery against her."
"Do I want my neighbor to covet my wife? No I don't. Therefore it is a sin for me to covet his wife."
According to Jesus this formula is prescriptive in nature, and can be applied to every imaginable circumstance. "So in EVERYTHING" He said.
Accordingly, those who think that homosexuality is a sin, must demonstrate why, given this formula. To say "homosexuality is a sin because my hermeneutic of the Bible says so" denies the reasoned nature of sin in favour of a arbitrary set of rules. Jesus clearly denies that sin is arbitrary.