Changes

During [[intercourse]] :#The [[penis]] is inserted into the [[vagina]].#[[Sperm Cell|spermSperm]] leaves the [[testes]](where they were made). It #The [[Sperm Cell|Sperm]] travels through the [[Sperm Duct]] where fluid is added by the [[Reproductive Gland|glands]] before travelling through the [[urethra]] as [[semen]] and coming out of the [[penis]] in a process called [[ejaculation]].#The [[Sperm Cell|sperm]] in the [[semen]] then swim up the [[vagina]] through the [[cervix]] and to one of the [[oviduct]]s where it meets the [[ovum]]. ===About "Safe Sex"===: During [[intercourse]] some [[Sexually Transmitted Infection|sexually transmitted infection (STI)]]s can be passed from one person to another.: [[Human]]s use several methods to prevent [[intercourse]] from spreading a [[Sexually Transmitted Infection|STI]] and also to prevent [[pregnancy]].:*Condom - A covering placed over the [[penis]] stops [[semen]] entering the [[vagina]] and can prevent [[Sexually Transmitted Infection|STI]]s being spread.:*Diaphragm - A cap placed inside the [[vagina]] to prevent [[semen]] getting past the [[cervix]]. This does not prevent the spread of [[Sexually Transmitted Infection|STI]].:*Contraceptive Pill, or Patch - A [[drug]] which prevents the [[fertilisation|fertilised]] [[ovum]] [[implantation|implanting]] into the wall of the [[uterus]]. This does not prevent the spread of [[Sexually Transmitted Infection|STI]].:*Spermicide - A chemical in a cream which can kill [[Sperm Cell|sperm]] before they reach the [[ovum]]. This does not prevent the spread of [[Sexually Transmitted Infection|STI]].