Maybe not: In America, it is unusual for a person to have significant vitamin deficiencies if he already eats an average amount of food and does not have problems digesting and absorbing nutrients. Much food in the US is already fortified with vitamins. That said, haven't heard of a vitamin deficiency that only affects the time period "after sex." His doctor can evaluate, and review details of what happens.
Answered 11/11/2019
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