The prevailing theory to resolve this paradox comes from limited studies of Lo’tfian physiology. The male brain, it is believed, is highly organized … - Charles Sheffield

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The prevailing theory to resolve this paradox comes from limited studies of Lo’tfian physiology. The male brain, it is believed, is highly organized and possesses powerful intelligence. However, it contains an unknown physical inhibitor, chemical in nature, that forbids the employment of that intelligence when in the presence of a Lo’tfian female. Confronted by such a female, the reasoning ability of the male Lo’tfian simply switches off. (A much weaker form of this phenomenon has been attributed to other species. See Human entry of this catalogue.) —From the Universal Species Catalog (Subclass: Sapients)