JUDD Apatow is a whiz at comedy, but a dud in the sack. The “40-Year-Old Virgin” director tells Playboy’s July/August issue that after his first time, “I said to the girl, ‘Hey, was it good for you, too?’ And she said, ‘Well, I guess it’ll get better eventually.’ Sadly, she wasn’t right. It wasn’t better for her or any of the women who subsequently agreed to sleep with me.” Apatow, whose new flick “Funny People,” opens July 31, also admits he tries to keep his private parts youthful. “I use Grecian Formula now. It still looks distinguished. From a certain angle it kind of looks like Ben Kingsley.”