Ahem ... the mind sees what it expects to see
Think no evil and you see no evil.
To the Japanese maybe it really IS just a collection of kawaii photos.
Although I'ld bet what your co-workers were scowling at is the injection of such base comparisons into an otherwise innocent work of cuteness.
Just my guess since I never saw any of the photos so I can't really tell how explicit they are.
Applications programming is a race between software engineers, who strive to produce idiot-proof programs, and the Universe which strives to produce bigger idiots.