Does a pre-ejaculate contains sperm? and if so can it get a virgin girl pregnant only from rubbing their parts?

i know it takes one sperm for fertilization of the egg , but in reality it takes more than 20 million per ml to get the job barely done right because the sperms die and some get lost , but there are myths about pregnancy from rubbing parts and only from pre-cm especially for virgins girls ... could that be scientifically true ...