Answer:
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Rest. If you had a pinched nerve, then you would stretch.
Pelvic inflammatory disease is the most likely cause in 99% of studies on this matter
Answer: The only way to have intercourse safely is to use protection, and even sometimes its not ultimately guaranteed the woman won't become pregnant. If you don't use protection, the woman is most likely going to get pregnant, so either use protection or just don't have intercourse at all. Also make sure you are mature and old enough to have intercourse in the first place.