The dissemination of knowledge about sex has occurred only since World War I. Medieval ignorance, coupled with the "sex-is-shameful" attitude and church repression, caused frustration and miserably unhappy marriages.

Please remove spaces between words.
ThedisseminationofknowledgeaboutsexhasoccurredonlysinceWorldWarI.Medievalignorance,coupledwiththe"sex-is-shameful"attitudeandchurchrepression,causedfrustrationandmiserablyunhappymarriages.