I believe you are referring to a word from the book The Hiding Place by Corrie ten Boom. Best I can tell it must mean something like fornication or sexual sin. I have been looking online but can't seem to find answers that agree. Good Luck!
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The German language often compounds words. SexSin = sexual sin. Sexsünde is knowledge of sexual: shame/crime/sin too heavy a for the immature/innocent to learn of before due time.