: It is no longer in active publication by major houses because of these legal sensitivities, which has led to its proliferation as a digital file (like the one you referenced).

The specific filename you mentioned suggests a digital distribution (likely via forums or file-sharing sites) with the following characteristics:

: It was designed as a sex education book for children and parents, aiming to provide a frank and open look at human sexuality and development during the height of the 1970s sexual revolution.

: The "eng-rus" tag indicates the archive contains both the English and Russian translations of the text.