lactophiliac
A lactophiliac is someone who gets a boner from cows. They’d rather have sex with a bovine than with their own girlfriend. They think cows are the pinnacle of sexual pleasure.
He had a full-blown erection in the middle of the grocery store when he saw a cow in the dairy aisle.
He tried to get a job at the farm so he could flirt with the cows all day.
He proposed to a cow and called it 'the most natural relationship ever.'