Stacy Valentine examines her motives for entering the adult-film industry that made her a star. Without archness, Christine Fugate’s documentary captures Valentine’s changing feelings about her lucrative, esteem-building job–within a few years of concluding that there was nothing particularly self-destructive about it, Valentine begins to see herself on a slippery slope. The movie challenges us to reconcile its snapshots of earnest entrepreneurs, colleagues, and fans with its long takes of her disillusionment. 122 min. Three Penny. –Lisa Alspector