Question

how sperm is formed and how sex is done 
how does ejaculation stops height growing

Answer 1

Sperms are the male gametes formed in the testes of human males. They are formed by the meiotic division of cells of the germinal epithelium  in the testis structure. Sex is the informal name given to sexual intercourse which implies insertion of the male penis into the woman's vagina with the ejaculation of millions of sperm cells so as to fertilize the ovum / egg in the female reproductive system. 
EJACULATION DOES NOT HINDER BODY GROWTH. This is a supersitious statement is FALSE.