“Call Me By Your Name” is an emphatic celebration of the mystery and power of sexuality, and all its attendant danger, exaltation and tenderness. Here in a small, Italian town, close to the sea — where Hellenic statues have a way of washing up on shore — the sun, the water and the surrounding beauty reinforce lust and longing; and everything is suffused with a charged, pagan innocence. It’s the least Puritan of movies, pre-Christian in its sensibility, and will perhaps seem jarring, arriving at this curious time in our cultural life.