Sorry, but its obvious you will need more than one conversation about sex between you before he rethinks his own rather strict ideas about sex. He was probably raised that way, so it may take longer than you think.
This is where you think more in building understanding through communications. It's a huge challenge to get in some ones mind. Especially if he was raised that sex was dirty or evil, or even worse was taught nothing.
You better recognize these things and not be distracted by your needs. Obviously you cannot openly, and calmly discuss anything, and that's the real problem to solve.