The 21 century will belong to the women. In China, India and other far east countries the ratio of male vs female is moving from 1.02 to 1.07 which in another 25-30 years cause a shortage of women. The figures today in China shows about 50 million males which will not find a bride.
Due to modern approaches the parents will be able to control the desired gender of their babies. So especially the Muslims will choose to give birth to males.
Now the engineers developed new sex machines which will supply "Machine Job"