It might be shocking to you, OP, but I have your fetish too. It stemmed from reading comic books and watching cartoons with the plot when I was a kid. I just loved how the insides looked and they made me feel good. I think it was the colors too, or it might've been a love of tight spaces. Around my teenage years, I came to the conclusion it was a fetish because the thought of being inside a hot guy always turned me on.