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The thing that attracts most people to May isn't just her body, it's that she's naturally attractive and cute and it doesn't feel like she tries too hard.
She was neither designed to be overly girly or pretty in a traditional sense, and she wasn't designed to be one of those seductive characters that purposely lures men in. She feels like the perfect combination of sexy but innocent, like the girl next door. I think the thing is May probably doesn't realize how attractive she is and that's what makes her more alluring. In the anime she almost never talked about her appearance outside of 1-2 scenes.