Why are liberals so focused on a homosexual sex act?
It's projection, and a calculated bit of it, to boot.
The Leftists KNOW that the rest of society abhors homosexuals as deviants and monsters, despite the fact that society has been conditioned like Pavlov's dogs to avoid confrontation with homosexuals.
So by constantly referring to conservatives with a homosexual act, it triggers an automatic negative response in the minds of the low-info's - and it's directed at the foes of the Left.