In the Old Testament, the objection was to the tradition of raping foreigners in order to establish dominance over them that was actually fairly widespread. Paul's words on "taking a man as if he were a woman" referred to the Greek tradition of wealthy men buying slaveboys to dominate.

Needless to say, rape remains firmly condemned.

There are no references to consensual homosexual sex between men in the Bible (unless you want to make an argument for David and Jonathan, a positive Biblical relationship) and no mentions of lesbian sex whatsoever.

Even if you ignore all of that and make the extremely tenuous argument that homosexuality is a sin, so what? If we want to make the argument that sinners can't be pastors, we won't last long.