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Skip navigation! Story from Sex. Kathryn Lindsay.

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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.

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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.

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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. In this study, we investigate possible correlations between sperm characteristics and paternity success in the socially monogamous bluethroat Luscinia svecica svecicapredicting that sperm length and sperm swimming speed is positively correlated with paternity success.

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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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There is one caveat, though. But we do not know which comes first. Does the good health make you more willing to have sex, or does the sex have a positive impact?

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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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The rare condition is more common in women, affecting up to 40, women in the United States. Keep reading to learn how to recognize the symptoms, your options for treatment, how this may affect your ability to conceive, and more. You may be having an allergic reaction if you experience one or more of the following symptoms after exposure:. For women, symptoms usually occur on the vulva or inside the vaginal canal.

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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.