Short sex

A professor was asked to give a talk on "Sex".
When his turn came, he stood up, and walked to the podium.
He then adjusted the microphone.
He said, "Ladies and Gentlemen, it gives me great pleasure..."
When his turn came, he stood up, and walked to the podium.
He then adjusted the microphone.
He said, "Ladies and Gentlemen, it gives me great pleasure..."
Spoiler: