"Mary Ann is a good girl. She was a virgin, so casting now is going to be difficult."

In short, the level of lewdness in Hollyweird has risen to the level that Wells can't think of someone who can even act like she's innocent. So when we have an entertainment culture that values scandals, special effects and "plastic surgeon effects" over little niceties like plot and character, we not surprisingly find that it's hard to find actors and actresses who can't even portray youthful innocence.