I think part of the problem for Updike where sex is concerned is his protagonists are often thinly veiled stand ins for Updike, imagining Updike having sex would have been like imagining your parents, for that generation, and then he keeps talking about it. Now it's more like your grandparents. It's like when granny tells you she got a tongue piercing because it really helps with fellatio, that stuff really increases the cringe factor.