If you are wondering why you've not seen Jessica Alba naked in a movie just yet, here's her reason. And it is pretty reasonable too.

She addressed her no-nudity clause in Glamour, saying that "I don't want my grandparents to see my boobs."
"I don't want my grandparents to see my boobs. That's it," the actress, 33, tellsGlamour in its June issue, on newsstands May 13.

"It would be weird at Christmas," she says. "And, I mean, really, if you look at the movies I have done, getting naked would never 'elevate' the picture."
That makes total sense somehow. [People]