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.
Answer:
lead to defect in vision
Explanation:
May cause myopia or hypermeteropia too and also leads to effect rods and cones
