Is pulling out an effective way to prevent pregnancy? Is precum safe?

If you do it correctly, pulling out is a pretty effective way of preventing pregnancy. But it can be hard to do it the right way every time. Pulling out also doesn’t protect against STDs, so using a condom is a good idea to help prevent STDs and add extra pregnancy prevention. Comprehensive review of the anatomy and physiology of male ejaculation: Premature ejaculation is not a disease

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Male ejaculation: Sparm