Earlier quoted context omitted.
So I think the main issue is how the buyer might perceive the packaging. If a coworker has issues... I think the coworker has issues. It's like someone finding Barbie offensive (for other than body image issues). I can't see it. Are these people who whisper and shuffle when they buy condoms or feminine products at the checkout counter? Do they wrap their wine or beer in brown bags? It's hard to imagine this person.
Masking one's preferences and behavior to avoid offense in a public is a defining element of Japanese society and culture. And while everyone there is more inured to these kinds of graphics, the design of packaging for everyday goods often veers towards the minimal/elegant for precisely this reason. https://en.m.wikipedia.org/wiki/Honne_and_tatemae
That said, that does not explain people reading the kinds of graphic novels and magazines they do in plain sight in public on trains in parks, etc.