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The frequency with which a man experiences lust depends upon his own physical condition, whereas the occasion which rouse such feelings in him depend upon the social conventions to which he is accustomed

Bertrand Russell (2009). “Marriage and Morals”, p.71, Routledge
The frequency with which a man experiences lust depends upon his own physical condition, whereas the occasion which rouse such feelings in him depend upon the social conventions to which he is accustomed