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Semen is known to contain hormones and proteins from the male, which could be useful to the mother to strengthen her immune system and improve tolerance. Scientists from Leiden University Medical Centre in the Netherlands tested their theory comparing the pregnancy history and oral sex habits of women. Oral exposure to seminal fluid seems to influence pregnancy outcome in a positive way.

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Republish our articles for free, online or in print, under Creative Commons licence. In romantic circles, reproduction is viewed as a harmonious venture between the sexes. In recent decades, however, evolutionary biologists have revealed this harmonious ideal could not be further from the truth.

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Data from: Lifetime reproductive success, selection on lifespan and multiple sexual ornaments in male European barn swallows. Content in the Dryad Digital Repository is offered "as is. To the extent possible under law, the authors have waived all copyright and related or neighboring rights to this data. Submit data now.

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Install our app to track your symptoms, predict patterns and get daily health insights. As you probably know, becoming pregnant has a lot to do with your monthly menstrual cycle or period. An ovary is a part of the female reproductive system, which means that it plays a really important role in the process of becoming pregnant.

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All relevant data are available from the Dryad repository at the following DOI: Postcopulatory sexual selection may select for male primary sexual characteristics like sperm morphology and sperm motility, through sperm competition or cryptic female choice. However, how such characteristics influence male fertilization success remains poorly understood.

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Download nest box plans for your region and habitat using our new Right Bird, Right House tool! More than bird species breed in North America, and the variations in their behaviors are fascinating and complex. Different species find mates, build nests, lay eggs, and raise their young in incredibly different ways. This overview is a generalization of the avian nesting cycle.

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