Original: A woman's orgasm between one minute before and up to 45 minutes after insemination favors the chances of that sperm reaching her egg. If, for example, she has had intercourse with more than one male, such an orgasm can increase the likelihood of a pregnancy by one of them.
Simplified: If she has intercourse with more than one male, it favors the chances of one or the other male's sperm reaching her egg.