"I love him just the way he is, but there is something turning him off."
If that is the case, then only he can tell you what the issue is and what you can do to change. There isn't much that strangers can tell you about his personal tastes, issues, and reasons for being turned off. All we can do is encourage you to ask him to open up to you, be honest with you, and ask him to help you with this issue because you love him very much and want to be more sexual with him.
