Is there a “normal” size for testes? Read on to know: Promiscuity versus parenting instincts Clinical evidence shows that men’s testicles “normally” range from 6-20 ml or 4 x 3 x 2 cm in size. If physiology - in this case, larger testicles - pulls men towards promiscuity and procreation, then cultural moors may exert a pull in the opposite …