Will Miss #91 - initials with a different cross-cultural meaning

I occasionally buy a packet of nutritional supplements which has "Ca and VD" on the front of it. The "VD" isn't venereal disease, but vitamin D, but the initials always bring syphilis and gonorrhea to mind. There are a lot of cases where the Japanese use of initials is completely innocent, but comes across very differently to me. One of the most common ones is "K.Y." You see it on shirts and