Wild Stab in the Dark: Maybe She Just Doesn’t Find You Sexually Attractive?
Slate: “She says the reasons for your wife’s trouble could be many. She could have vaginismus, which causes her vaginal muscles to go into spasm and can make intercourse almost impossible. She could have had a trauma in her childhood connected to sex, ranging from abuse to being raised with a punitive attitude toward it. She could be consumed by thoughts of you with other women.”