Same as on land: Even marine mammals like dolphins and whales having sex in the ocean don't get pregnant without an ejaculation. We humans have little chance at all, if the dolphins and whales can't do it. If worried about that rare chance of pregnancy from sperm getting out of the penis before an ejaculation, one can do a home pregnancy test 3 weeks after sex or 1 week after missing a period.
Answered 7/10/2016
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