If a woman becomes faithful, chaste wife, then the next life there is chance of her becoming a male. Because according to Vedic literature, to take birth as woman is low grade. Striyaḥ śūdrās tathā vaiśyā ye 'pi syuḥ pāpa-yonayaḥ (BG 9.32), in the Bhagavad-gītā. The . . . as there are higher-grade and lower-grade births, so according to Vedic understanding, the woman, the body of woman is lower-grade birth. Therefore if she's fortunate to have a good husband, devotee, and if she becomes faithful to that husband, then her life is successful. That is called tapasya.
So Gāndhārī did it. Gāndhārī . . . in India still, marriage does not take by canvassing all of a sudden. The father, mother, especially in aristocratic family, royal family, even in Western countries, the father, mother selects the husband or wife. Even in England, the King Edward VIII, he was intimately in friendship with a common girl. So the state would not allow him that "You can marry a common girl." So at that time the prime minister, one Mr. Baldwin, he said to him that "Either you have to give up the company of that common girl or you have to give up this empire." So out of sentiment, he gave up the empire. Later on he was very sorry. And his second brother, George VI, he . . . George VI means the father of the present Queen, Elizabeth. So still this is current in aristocratic family, that the husband and wife should be selected by the parents.