Since its formation to the fertilization of the egg, spermatozoids have to cross a complicated path full of obstacles. Only one spermatozoid will overcome all the barriers and fertilize the egg, creating therefore a new being.
In order to achieve a natural pregnancy, a minimum concentration of motile sperm is required. Likewise, there should be no obstruction of the Fallopian tubes and sexual intercourse should take place during the woman’s fertile days.
It takes place in testicles and lasts two months and a half approximately. It is the maduration of some cells that split, madurate, and eventually become spermatozoa.