... The fool Paurus had allowed himself to believe that the celestial creature in his bed was Vishaka... little had the imbecile realised that Vishaka was a trained vish kanya -- a poison maiden. In fact, Chanakya had personally supervised the creation of an entire army of such maidens. His secret service would identify young and nubile girls whose horoscopes foretold of widowhood. These beautiful damsels would be sequestered at an early age and fed a variety of poison in graduated doses, making them immune to their ruinous effects. By the time each of Chanakya's vish kanyas reached puberty, they were utterly toxic. A simple kiss with an infinitesimal exchange of saliva was lethal enough to kill the strongest bull of a man.
However, there was one golden rule that could never be broken. They each had to drink a glass of specially formulated milk in the evening... Each lactic potion was specifically mixed for a given girl... Between ages six and eight, the girls who showed no signs of pubertal development would be given one kuduba of powder-blue milk formula each day. As they progressed to ages eight and ten and their breast buds began to appear, they would be given two kudubas of a saffron-orange brew every day. From ten to twelve as their pubic hair began to grow the daily dosage of the concoction went up to three kudubas of a pistachio-green mixture each evening... Between ages fourteen and sixteen, as they went into ovulation and mestruation, they would be fed two adhakas of an almond-brown lactic potion daily.
...all the girls, without exception, were born on Tuesdays during the seventh lunar day of vishaka. They possessed unfortunately potent horoscopes that guaranteed any man they cohabited with would die. They were known as vish kanyas, or poison maidens.