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Household Contaminants May Cause Infertility in Men, Dogs

The researchers carried out identical experiments for both species using samples of sperm from donor men and stud dogs, living in the same region

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The results showed that the pups' attractiveness was lowest at birth and increased to a maximum before 10 weeks of age before declining and then levelling off.
Representational Image. pixabay

Environmental contaminants found in home and diet have the same adverse effects on male fertility both in humans and domestic dogs, finds a new study highlighting the decline in sperm quality in both the species over the past few years.

The findings, published in the journal Scientific Reports, showed the chemicals — at concentrations relevant to environmental exposure — have the same damaging effect on sperm of both man and dog.

“We know when human sperm motility is poor, DNA fragmentation is increased and that human male infertility is linked to increased levels of DNA damage in sperm,” said co-author Rebecca Sumner, postdoctoral student at the University of Nottingham, Britain.

“We now believe this is the same in pet dogs because they live in the same domestic environment and are exposed to the same household contaminants,” Sumner said.

Family walk with dog. Pixabay

For the study, the team tested the effects of two man-made chemicals — the common plasticiser DEHP, widely used in the home (e.g. carpets, clothes, toys) and the industrial chemical polychlorinated biphenyl 153, which although banned globally, remains widely detectable in the environment, including food.

The researchers carried out identical experiments for both species using samples of sperm from donor men and stud dogs, living in the same region.

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“This new study supports our theory that the domestic dog is indeed a ‘sentinel’ or mirror for human male reproductive decline. Our findings suggest man-made chemicals, widely used in home and working environment, may be responsible for the decline in sperm quality,” lead author Richard Lea from the varsity noted. (IANS)

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Men Initiate Sex 3 Times More Often Than Women, Says Study

The longer the relationship had lasted, the less often the couples had sex

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Every couple must try to spend quality time together to improve communication. Pixabay

Men initiate sex more than three times as often as women do in a long-term, heterosexual relationship, says a study.

The researchers investigated what are the other factors which play a role for the frequency of intercourse in couples in long-term relationships.

The study, published in the journal Evolutionary Behavioral Sciences, suggests that two factors are decisive in how often women take the initiative at all — their attitude towards casual sex and passion.

The researchers considered several factors in their study such as how happy people are in their relationship, how committed they feel to their partner, how intimate they are, how much they trust each other and the love between them.

“Passion in the relationship is of great importance for intercourse frequency,” said the study’s first author Trond Viggo Grontvedt from Norwegian University of Science and Technology (NTNU).

Representational image.

“Passion is actually the only one of these factors that matter. We didn’t find any association between any of the other aspects and how often people have sex in couple relationships,” he added.

The study included 92 couples aged between 19 and 30. Relationships varied in length from one month to nine years, with an average of just under two years. The couples had sex two to three times a week on an average.

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The longer the relationship had lasted, the less often the couples had sex.

The study also revealed that desire for others reduces passion. “Strong sexual fantasies about others than the partner don’t mix well with passion in a relationship,” said Mons Bendixen, Associate Professor at NTNU. (IANS)