Well, figure he's probably your standard male when it comes to is basic emotional physiology. Which means he's insecure about being a good husband, insecure about being a good mate, insecure about being a good provider, and insecure about pleasing you in the bedroom.
So, he asks questions and is curious because he wants to make sure that you're happy with him as a husband, which definitely includes his ability to keep you well pleased in the bedroom. So, perhaps he worries that perhaps you're not getting the variety that you need to stay happy long-term.
Or, perhaps he's just genuinely curious about your sexual past. Or perhaps he's just a kinky bastard and wants spank-bank material because he secretly gets off on the thought of you being "wild" and "naughty"?
Unless he uses that information against you in a negative manner or takes it as a personal failing of his, I don't see any reason to not continue to answer his questions.
I'm not sure there is such a thing as full disclosure. Some people really don't remember everything they've ever done in their lives sexually.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."