American Gigolo, about high-class stud and phallic martyr Julian Kaye, who bestows orgasms upon the love-starved matrons of Beverly Hills the way Jesus bestowed loaves and fishes upon the starve-starved multitudes of Bethsaida, turned 40 on February 1. Which means this erotic thriller, written and directed by Paul Schrader, maintaining perfectly that precarious balance between purity and profanity, art and trash, and starring Richard Gere, at his preening, narcissistic best, is now as old as…