Sir: Hanging a kilogram weight on the end of an erect penis to ascertain the "virility" of the subject is patently inaccurate (Column One, 5 December). The force exerted depends on the weight multiplied by distance, so that the man blessed with 20cm has to bear twice the load of his less fortunate counterpart with only 10cm.
J E SEVEN
Halesowen, West Midlands
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