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At first, the drop was attributed to the Great Recession, and then to the possibility that Millennial women were delaying motherhood rather than forgoing it. But a more fundamental change may be under way. In 2017, the U.S. birth rate hit a record low for a second year running. Birth rates are declining among women in their 30s—the age at which everyone supposed more Millennials would start families. As a result, some 500,000 fewer American babies were born in 2017 than in 2007, even though more women were of prime childbearing age. Over the same period, the number of children the average American woman is expected to have fell from 2.1 (the so-called replacement rate, or fertility level required to sustain population levels without immigration) to 1.76. If this trend does not reverse, the long-term demographic and fiscal implications will be significant.
Many insects use a sex determination system based on the number of sex chromosomes. This is called X0 sex-determination—the 0 indicates the absence of the sex chromosome. All other chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes. In field crickets, for example, insects with a single X chromosome develop as male, while those with two develop as female. In the nematode C. elegans most worms are self-fertilizing XX hermaphrodites, but occasionally abnormalities in chromosome inheritance regularly give rise to individuals with only one X chromosome—these X0 individuals are fertile males (and half their offspring are male).
Ian Kerner, the New York sex therapist, told me that he works with a lot of men who would like to perform oral sex but are rebuffed by their partner. “I know the stereotype is often that men are the ones who don’t want to perform it, but I find the reverse,” he said. “A lot of women will say when I’m talking to them privately, ‘I just can’t believe that a guy wants to be down there, likes to do that. It’s the ugliest part of my body.’ ” When I asked 20-somethings about oral sex, a pretty sizable minority of women sounded a similar note. “Receiving makes me nervous. It feels more intimate than penetration,” wrote one woman. “I become so self-conscious and find it difficult to enjoy,” wrote another.
This one is especially for men. You need to have good control on your muscles to ensure that you can ejaculate at an appropriate time. Too soon and you may leave your partner unsatisfied; too late and it might leave your partner feeling as if they're pumping iron at the gym. To avoid this, spend a lot more time on foreplay (this will help men as well as women). If you take too long and can only ejaculate via manual stimulation, do your best to get your partner to orgasm and then they can return you the favour.