"What has lead to this marriage squeeze? First, millions women have gone 'missing'. A generation ago, a preference for sons and the greater availability of prenatal screening meant first Chinese couples, then Indian ones, started aborting female fetuses and only giving birth to boys. At its extreme, in parts of Asia, more than 120 boys were being born for every 100 girls. Now, the generation with distorted sex ratios at birth is reaching marriageable age. The result is that single men far outnumber women."