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When it comes to having sex, first-born girls tend to lose their virginity at a later age than their younger sisters, according to new Australian research.
The study, which was presented to an Australian Society for Human Biology conference recently, was carried out by researcher Fritha Milne, from the University of Western Australia, who examined the sexual appetites and behaviours of siblings.
Previous studies have shown that firstborns are more likely to be confident and family oriented, whilst middle-born children have the toughest time. Now, it seems there are also differences when it comes to reproductive strategies, including the age at first sexual intercourse, first pregnancy and first birth, with the middle-born children standing out in the survey results.
Middle-born males have sex for the first time at a younger age than their brothers, and last-born females are younger when they have sex for the first time. But middle-born children of both sexes tend to have fewer children of their own, the report suggested, with females 2.6 times more likely to fall pregnant at any given age.
Milne said that her work confirmed the first five years of a child’s life are important:
During this time the young must elicit support and resources from the parents,
If there are any siblings, then the siblings have to compete for the limited resources of the parents.
In order to maximise the resources that the children get they have to find themselves a different niche within the family to get those resources from the parents.
She went on to explain that the oldest children tend to align themselves with the “parental status quo,” which partly explains why they’re more conservative in their sexual choices.
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