Pregnancy is not an issue, but disease transmission is still possible. Some STDs can take six months or longer to show up on a test. These are common occurrences during first-time sex, or when you're feeling nervous.
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However, if they remain insistent, or demanding, or even attempt emotional blackmail such as "If you loved me you would keep going," send them home to cool down, and re-think if you want to be in that situation with them again.