Easy A is an amusing, teen comedy spin on The Scarlett Letter. The movie takes its inspiration from the classic (but hard to read or enjoy) novel. Easy A is very much in the vain of Clueless or 10 Things I Hate About You, but its script isn’t as clever as either of those two films. It’s more mildly amusing than laugh out loud funny. Still, Easy A hits on some truths about the pain of high school life and the obvious double standard involving sex. Guys get congrats and body bumps for having a lot of sex, while girls are …