Unprotected Sex

Unprotected sex is a risk for unwanted pregnancies and sexually transmitted infections. Is unprotected sex always risky? Are there any secure days in the menstrual cycle? Can you have unprotected sex during not fertile days? How calculate fertile days? How to calculate ovulation days and how many days after or before ovulation unprotected sex is not recommended (if you are not planning a baby!)? How many days sperm can survive in women body? Is unprotected sex during period secure? Are natural methods of contraception secure for unprotected sex?
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