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It's not uncommon to notice some blood after sex. If you've ever started bleeding after sex, you may have chalked it up to getting your period. And it turns out, there may be some logic to that thought.

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Several studies have documented shifts in humoral immune parameters e. It is thought that these shifts may reflect dynamic balancing between reproduction and pathogen defense, as certain aspects of humoral immunity may disrupt conception and may be temporarily downregulated at ovulation. If so, one could expect maximal cycle-related shifts of humoral immunity in individuals invested in reproduction — that is, women who are currently sexually active — and less pronounced shifts in women who are not reproductively active i.

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Many specialists associate changes in sex drive with fluctuations in the ratio of estrogen and progesterone — the hormones produced in the ovaries. A boost in estrogen can lead to increased libido before period, while boosted progesterone leads to a lower sex drive. These parameters fluctuate at different phases of the menstrual cycle.

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Though period sex can be a bit messy, it is safe. Orgasms may relieve menstrual cramps. Menstrual cramps are a result of your uterus contracting to release its lining. When you have an orgasm, the muscles of your uterus also contract.

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Cycles were divided into 5 phases based on their luteinizing hormone surges. Daily questionnaires and saliva for IgA and cortisol analyses were obtained. Our study discovered, and confirmed, systematic differences in eating, sleeping and health patterns across women's menstrual cycles.

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Delayed periods can be stressful and can sometimes lead sexually active individuals to believe they're pregnant. But, a late period could be caused by many factors that aren't related to pregnancy. In some cases, a late period can be indicative of other underlying health conditions.

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The way sex feels can change throughout your cycle. Something that felt great on day 14 may be less comfortable on day These changes are real, and happen in response to your reproductive hormones. You may not notice a pattern until you pay attention to timing.

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Right after a period, women have better spatial awareness. Three weeks after, verbal skills peak. It turns out the monthly cycle does change the brain — but not in the ways you think.

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Though it may pose some logistical concerns, there's no scientific evidence that having sex during your period is harmful to your health. Some women even find that having intercourse while menstruating brings several benefits and is more pleasurable than it is at other times. It's important to remember, though, that just because your body is eliminating your uterine lining because an egg was released but not fertilized doesn't mean you can't get pregnant while you have your period. Likewise, concerns about sexually transmitted infections are the same regardless of the time of the month.

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