My wife (F40) and I (M43) have been married for 21 years. She's never been one to shave her pubic hair. Twice in the past year I've noticed that she shaved her pubes. Since we have a relatively dead bedroom, I know it wasn't something she did for me. (and she knows my preference is for it not to be shaved.) When I noticed and asked why she did it she made sure not to sound defensive, but immediately made me feel silly for even asking the question. She said it is purely for hygienic reasons because it's better not to have hair there during her period. But if that's the case, why only shave twice in 12 months? Am I overthinking this?