So, when you hear the phrase "Gomu o tsukete" (Put on the rubber) outside of a very specific stationery or industrial context, the default assumption in the Japanese subconscious jumps immediately to safe sex.

The word gomu itself is a loanword from Dutch ( gom via Portuguese borracha ). It can mean:

In many cultures, including Japan, discussing sexual health can sometimes feel awkward or "mood-killing." However, being clear about your expectations is the only way to ensure both partners are on the same page.

Frame it as a standard part of your routine rather than a special request.

As for me? I walked out of that stationery store with my notebooks, my "gomu" (eraser), and a bruised ego. But I also walked out with a story I’ll never forget.