Sperm don’t really swim in the vagina. They are deposited by ejaculation close to the cervix, and they enter the uterus through the cervix. If the woman orgasms, it causes the cervix to contract and dip into the pool of semen, so fellas make sure your lady cums!
This post, and most of the responses, seem to suggest that most guys have no idea what goes on inside a lady.
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