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My father was 31 when he married my mother, aged 19, in 1958. I was born in November of 1959, so I don't think Grandpa Langley had to stand behind Dad with his shotgun at the altar or anything like that. Dad told me very little about his adult life before he married Mom, and I suspect he just had little to tell in terms of experiences with women in his teens and 20's. He might even have been a virgin when he got married.
Yet he had a pharmacy degree and he worked as a pharmacist, so he knew more about biology and medicine than most men in his generation. He must have filled prescriptions for contraceptives as well, so I can't attribute his discomfort with advising me about sex to ignorance. That leaves relative inexperience as an explanation.
I suppose religion played a role in this sex-negativity, but we stopped going to church (a Southern Baptist one) when I was 14 (I never inquired into the reason, and I didn't miss it); and the family just wasn't overtly religious afterwards.