You know you have 46 chromosomes. If you're lucky, you've got 23 from each parent. Sometimes you get an extra one or drop one out, but -- so you can skip the grandparent and great-grandparent stage and go right to the great-great-grandparent. And you have 46 people and you give them a scanner, or whatever you need, and they look at their chromosomes and each of them says which one he likes best, or she -- no reason to have just two sexes any more, even. So each child has 46 parents, and I suppose you could let each group of 46 parents have 15 children.
Xa sabedes que os seres humanos temos  46 cromosomas. Se tes sorte, 23 de cada proxenitor. Ás veces tes un de máis ou un de menos, pero, podemos saltar  a etapa do avó e ao do bisavó, e vaiamos directos ao tataravó. Desta maneira tes a 46 persoas, e dáslle un escáner a todas elas,  ou o que precisen, miran os seus cromosomas,  e cada un deles di cal lles gusta máis. Xa non hai razón para ter tan só dous sexos. Deste modo,  cada neno tería a 46 pais, e supoño que poderíamos permitir que  cada grupo de 46 puidese ter 15 nenos.