They kissed. And then we cut to a post coital conversation. A scene like that would not be out of place in 50's Hollywood. Or many modern soap operas from conservative/puritanical countries. But he writes movies (don't forget he writes or cowrites his films) so that he needs to use sexuality, sensuality and eroticism as little as possible. Which feels like he wants to avoid it as much as possible. He deliberately avoids such such subject matter. This combined with the fact that on the whole his entire career is filled with films that are entirely sexually dry points to the fact that he is relatively prudish.