Teen Boys Sperm
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Teen Boys Sperm
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Semen specimens from 134 pubertal boys were examined, and some 274 assays were made. An analysis of the biological quality of semen in relation to the period of time after first ejaculation brings high values of statistical dependence of the volume of semen, its liquefaction, spermatozoal concentration, percentage of morphologically normal forms of spermatozoa, and normal spermatozoal motility on the period of time after first ejaculation. Normal figures for semen volume, semen liquefaction, spermatozoal concentration, and morphology are observed 12-14 months after first ejaculation. The percentage of normally motile spermatozoa becomes standard 21-23 months after first ejaculation. There were changes in semen characteristics from azoospermia through cryptozoospermia, oligozoospermia, and asthenozoospermia to normospermia. Azoospermia dominates until the fifth month after the first ejaculation, oligozoospermia from the sixth to the eleventh month, asthenozoospermia from the twelfth to the twentieth month, and normospermia from the twenty-first month.
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This article is more than 7 years old
This article is more than 7 years old
Hannah Devlin science correspondent
The error rate in the sperm cells of teenage boys is about 30% higher than that for young men. Photograph: Sarah Jones (debut Art)/Getty Images
Wed 18 Feb 2015 06.01 GMT Last modified on Wed 14 Feb 2018 21.43 GMT
Original reporting and incisive analysis, direct from the Guardian every morning
© 2022 Guardian News & Media Limited or its affiliated companies. All rights reserved. (modern)
A new study by scientists at the University of Cambridge claims teenage sperm is genetically weak, but is the claim credible?
Teenage boys already have plenty to worry about: spots, girls and the size of their “thing”, as Adrian Mole might have put it. Does the problem of having genetically weak adolescent sperm really need to be added to this list?
Scientists at the University of Cambridge have suggested this is the case after carrying out a study involving more than 24,000 parents and their children. The analysis focused on tiny genetic differences between parents and offspring, which are assumed to be caused by copying errors in the egg or sperm cells.
The study shows that, on average, fathers pass on at least six times as many of these mutations to their children as mothers. This suggests sperm DNA is a less faithful replication of the father’s genetic sequence, probably because sperm cells have undergone more divisions than the female egg cell by the time conception occurs.
The more striking claim – and the one that got most attention – is that the error rate in the sperm cells of teenage boys is about 30% higher than that for young men.
The researchers say this could explain why children of teenage fathers have a higher risk for disorders such as autism, schizophrenia and spina bifida.
The paper’s author, Peter Forster, said: “Children of 15-year-old boys have about 30% more mutations than children of young men. It’s a J-shaped distribution.”
This probably translated to a risk of birth defects of about 2% for teenage boys, compared with an average risk of 1.5%, he said.
Forster said: “It could be that the whole sperm production system is more error prone at the start … that it just isn’t optimised yet.”
He said that the theory had even prompted the idea, by another journalist, that if teenage boys masturbated more, they might be able to work their way through this “suboptimal” period more rapidly.
Before teenagers heed this suggestion (don’t they already devote quite a lot of time to this activity?), it’s worth looking at the paper itself , in the Royal Society Journal Proceedings B.
The odd thing is the complete absence of the J-shaped curve. Here’s the graph, which looks like a straight line to me.
It is true that the data point for teenage boys may show a slightly higher number of mutations than that for the 20- to 30-year age range, but it still appears to overlap with the 95% confidence interval for the linear trend. I can’t see any reason to conclude that “the germ cells of adolescent boys are an exception to the ageing rule”, as the authors do.
If you were going to go down that route, you might also wonder why sperm goes a bit dodgy at 30, but then recovers again with the approach of middle age, because there seems to be a spike in the 30-35 category. A simpler explanation is that the data is just a bit noisy.
Allan Pacey, professor of andrology at the University of Sheffield, agrees: “This doesn’t make sense to me. I don’t see a J-shaped relationship and, in terms of biology, I can’t think of anything that would explain it.”
Forster points to several population studies, which hint that teenage fathers may be more likely to have children with various disorders. But it is hard to say whether such results are linked to direct genetic causes or social and environmental factors. For me, this latest studydoes not do much to resolve the issue. As Pacey puts it: “I don’t see any great concern for teenage dads.”
And for those teenage boys who are not dads, there are probably other reasons to wait until their 20s to embark on fatherhood.
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Having never been a boy, I had no idea about all the weird shit boys do to get off. Even though I had a big brother, I wasn’t privy to the vast array of strange self-satisfying tools and tricks teenage boys have up their sleeves. That is, until I met my husband and he told me a hilarious story about why he loved climbing the pole at school.
“At first,” he explained, “I just climbed because I liked to see how fast I could get to the top. But one day when I climbed something weird happened. It felt really good. Like, so good I would make sure to climb that pole every morning and every lunch.”
Even as my own sons grew, I didn’t understand just how resourceful boys could be, until I questioned my then-12-year-old about why he had a giant box of condoms in his bedroom.
His hesitation should have been my first clue.
“Well, umm,” he said. “I use them to, uh, you know…”
“To what?” I asked. I had no idea what he was trying to say.
“Oh. Oh, well, OK,” was all I managed to say.
A week later, while out for drinks with my girlfriends, who also had teen boys, I asked if that was normal.
“I don’t know about condoms,” my friend Tammy said, “but I found out my son Charlie was using socks.”
“Socks?” I had never heard of boys sexualizing slippers.
“Yeah, socks. Your boys don’t do that?” Tammy asked. “Well, Charlie does. I swear I won’t even touch his laundry anymore. All it took was one time grabbing a sock that was hard as a rock and I was done. It was nasty!”
Learning about socks, and laughing my ass off watching the Bridesmaids scene where a mom describes cracking her son’s comforter, made me curious about what other means boys employ to get their (pun intended) socks off.
Naturally, I first turned to my husband and sons to learn more. I was in for a surprise with their answers.
Like machine gun fire, my eldest son listed his favorite masturbation props.
“Let’s see, there’s good old wadded-up toilet paper, towels, even shirts. Heck, I’ll use dirty laundry if it’s there. Whatever is within reach, really,” he shared. As he spoke, my younger son nodded his head emphatically.
“Anything else?” I asked. I was all business. Hey, who was I to judge? As a teen, I’d had an amorous moment or two with my favorite bottle of perfume, Love’s Baby Soft, which, if anyone remembers, was totally shaped like a dildo.
“OK, don’t laugh, but one time I put my penis in the vacuum hose,” my youngest said.
“While it was on?” I asked. I’d lost my deadpan expression the moment I picture my son losing his penis in a vacuuming accident.
“Yeah, but it was on low, don’t worry,” he reassured me. “It didn’t feel that good, so I only did it once.”
“Oh, what about paper towel rolls?” my oldest added. “And that time I used the cantaloupe?”
Even my husband was shocked at the cantaloupe revelation. Fruit. Really? I thought that was only a thing women in prison did.
“And the trash can,” my youngest said. Was nothing sacred?
By the end of our conversation, I had the idea that my sons, and probably all teenage boys, used anything an
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