Re: odd question

wrt size, the internal development of the female reproductive organs roughly mirrors the external development of the male.

in boys, the first indication of puberty is increased size of the penis and testicles and pigmentation of the scrotum. generally this occurs around age ten. two boys can be the same height and build and otherwise appear to be at an identical stage, but exhibit marked differences in genital development.

analogous changes occur in girls, although they are less obvious: changes in the colour and texture of the vulva, increased size of the labia minora, changes in the hymen, which thickens and becomes more elastic, and a slight swelling of the abdomen, reflecting growth of the uterus. like puberty itself, these changes occur one or two years earlier in girls than boys.

although many traditional culture's allow marriage of girls before puberty, it makes no reproductive sense for a girl to breed at this age. intercourse with a fully developed male would probably be painful, and a pregnancy dangerous.

however, in societies where it's tolerated, intercourse among prepubescent peers is relatively common. there is evidence that boys are 3 or 4 times more likely than girls to be sexually active at this age, which suggests that those girls who are active are also promiscuous. in human females there is also a period of adolescent subfertility, which seems to have evolved to allow a kind of sexual apprenticeship before the rigors of motherhood.

i think there are a raft of factors driving the modern suppression of child sexuality
, including larger and more condensed communities and the extension of childhood itself in response to the increasing complexity of human culture. a girl child has much to lose by being stigmatised as a consequence of sexual adventurousness, and is also at increased risk of sexual assault, disease and early pregnancy, so it's not hard to understand why parents are so protective.

in short, a nine or ten year old girl might be capable of intercourse with an adult male, but it would likely hurt her in other ways, and i think it would be a cruel and not a loving act.