Just studies that are tiny happened since. Each, scientists examined the secretions under a microscope and found that none of them contained sperm in a 2003 experiment with 12 Israeli men who gave at least two samples of preejaculate. Another study that is small discovered no semen.
Several years ago, researchers in England while the U.S. attempt to more rigorously investigate the fertilizing potential of preejaculate, noting that “no research has discovered motile semen in the pre-ejaculate.” Their paper, posted in Human Fertility last year, analyzed 40 types of preejaculate from 27 volunteers. Ten for the volunteers (37 %) produced examples that included “a reasonable percentage” of motile semen.
Because a number of the guys provided examples on numerous split occasions, an interesting pattern emerged: semen had been present either in each of an individual’s samples or in do not require.