Answer from Dr. Locker
Yes (but it is not common). When a man is erect and sexually aroused, or just prior to ejaculation, he may emit "preejaculatory fluid" also called "precum," which is a fluid that contains some stray sperm, which can get a woman pregnant. It can also may contain sexually transmitted diseases. That is why withdrawal before ejaculation during intercourse (also know as "pulling out") is not an effective method of birth control and is not an effective method for preventing sexually transmitted diseases. To prevent pregnancy and disease transmission, do not let precum come in contact with a woman's vagina, and use condoms.
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