Marketing Chinese board games to '60s swingers

With psychedelic type and day-glo graphics, this 1969 edition of the board game "Guru" -- recently unearthed in my basement (given to me by my friend Meredith when she moved away) -- promises "ACTION!" for "swingers of all ages." But upon opening the box, I found it's a rather unsexy, if creatively designed, version of the ancient Chinese game GO. (Oddly, the neon colors of the board and packaging clash with the plastic game pieces in primary colors.) Manufactured in Finland by E.S. Lowe Company, the game's instructions offer straight-ahead directions, with nary a mention of swingers. Perhaps the term had a different meaning then? Or maybe tossing about the word "swingers" was smart marketing back in '69?