Actually, pre-cum has never been proven to contain a significant sperm count apart from when the male has had a recent ejaculation and the ejaculate has not been flushed out (ie. by urine).
Therefore, if you allow a certain amount of time between sessions ans take a pee, the chances of active sperm in the pre-ejeculate is very low.
However, it is best to be on the cautious side and use other contraception such as a condom.
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