Differential burns of head and pubic hair

A woman, who was hospitalized with extensive burns in the genital and perineal region, accused her husband who lived apart from her to have inflicted the injuries with a lighter and a burning candle out of jealousy. The husband denied the accusations and stated that he wanted to singe off the pubic hair with the lighter during sadomasochist sexual practices performed in mutual agreement. As he did so extensive flames suddenly developed--something he had not expected--thus causing the burns. To check the statement cut off tufts of head and pubic hair were set on fire with a lighter to compare their burning behaviour. Pubic hair was easily inflammable and burnt almost completely within about 10 seconds developing up to 10 cm high flames, whereas straight head hair developed only minor flames and the singed hairs stopped burning spontaneously some seconds later already.