Ovulation occurs at approximately Day 14 in a 28 day cycle, but occurs earlier in a short cycle and later in longer cycles. When an ovum is present , there is a relatively short period of approximately 24 to 48 hours when the woman is fertile. During this fertile period, sperm must be present in the fallopian tube and reach the egg. Only one sperm is required to fertilise the ovum but in order for this to occur there must be a minimum of 40 million sperm per ml in the semen deposited in the woman's vagina. If the ovum is not fertilised, it dies.
Sexual intercourse is an important component of human sexual behaviour.
It is usually accompanied by much pleasure for both people, which forms the basis of the strong bond which develops between sexual partners. Sexual intercourse may result in pregnancy and is a component of reproduction. All rights reserved.