Precum. There is an outflow of clear, viscuous fluid ahead of the ejaculate which is felt to adjust the environment for the optimum survival of the spermatozoa to follow. Precum is not always free of sperm so keep this in mind depending upon your goal for sexual intercourse. Some term this pre-sperm but this is not commonly used.
Unprotected sex 10 days before ovulation day. No ejaculation. What is chance of pre sperm survival? 32 day cycle. Sex day after period ended.
The medical . community is not able to calculate such probabilities mathematically, especially with so many unknowns - one guy's preejaculate is not going to be the same as another's, or even his own at a later date. With respect to impregnation, as with other medical events (like a freakish disappearance of a brain tumor without treatment) the strangest things have happened. There is no answer to this question. Read more...