Should anyone doubt that previous generations entertained odd, unusual, misinformed, even outright bizarre notions about what constituted a healthy mind, a healthy body and a healthy, rational attitude about matters sexual, look no farther than Henry Stanton's treatise Sex; Avoided Subjects Discussed in Plain English.
Often hilarious with it's excessive Victorian prudity, the medical and psychological advice given is sometimes downright alarming. Going blind is the least of your worries. It's safe to say that a couple completely ignorant of the intricacies of sex and marriage would fare better than young newlyweds schooled by Stanton.