Where are guys ticklish at and why won't my boyfriend tell me where he is ticklish at?

My boyfriend and I were talking on the phone and I asked him where was he ticklish at. He would not tell me. He told me that he's not stupid and was not going to tell me where he is ticklish at. I told him where I was ticklish at. So, I stopped asking him.

I mentioned and asked him another night and he still would not tell me. I told him the only places I could think of is the feet, tummy, underarms, or sides. He told me I don't want you to see and your be tickling me there.

Where are guys ticklish at? Why would he not tell me and I am his girlfriend? Could it be he's embarrassed to tell me or is it a private area or something else?
Where are guys ticklish at and why won't my boyfriend tell me where he is ticklish at?
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