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In areas where there are fewer females, males are forced to groom their partners for up to twice as long before they are able to have sex, the research found. Sexual activity among a strong group of long-tailed macaques in Kalimantan Tengah, Indonesia, increased after bouts of male-to-female grooming, according to findings published in Animal Behaviour journal and reported in New Scientist. On average, females had sex 1. The monkey version of the "world's oldest profession" is also a rare example of market forces acting in nature, with the availability of females affecting the "price" of mating.
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Primate Factsheets – Glossary

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Monkey business: Male chimps 'pay for sex' by grooming their mates | Daily Mail Online

The notion of such "transactional sex" among chimpanzees has been critiqued by many scholars, however; androcentric bias and researchers projecting their own gendered assumptions onto non-human animals may play a significant role in interpretations of "prostitution. Penguins use stones for building their nests. Some pair-bonded female penguins copulate with males who are not their mates and then take pebbles for their own nests. According to the report about the study published by BBC News Online , some female penguins sneak around on their partners. These prostitutes have sex with unattached males and take a pebble from the male's nest after having sex.
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Sex differences in rhesus monkey toy preferences parallel those of children

Acid rain precipitation with a high concentration of acids from pollutants such as sulfur dioxide and nitrogen oxide that are emitted during the burning of fossil fuels in industry or vehicles; acid rain has a destructive effect on plant and animal life and buildings. Affinitive characterized by a natural liking for or attraction to. Age-graded group an intermediate primate group type between single-and multi-male, in which there are fewer males per female than in true multi-male groups, and a linear dominance hierarchy operates among males that corresponds to age Parnell
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Socialization processes, parents, or peers encouraging play with gender specific toys are thought to be the primary force shaping sex differences in toy preference. A contrast in view is that toy preferences reflect biologically determined preferences for specific activities facilitated by specific toys. Sex differences in juvenile activities, such as rough and tumble play, peer preferences, and infant interest, share similarities in humans and monkeys. Thus if activity preferences shape toy preferences, male and female monkeys may show toy preferences similar to those seen in boys and girls.
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