Changes

Sexual intercourse involves the man inserting his penis into the female's vagina, and thrusting until ejaculation occurs within the female.

Sexual intercourse involves the man inserting his penis into the female's vagina, and thrusting until ejaculation occurs within the female.

In reproduction through sexual intercourse,  the male and female gametes, the sperm and egg, are united.  These gametes carry just one half of the genetic material (chromosomes) from each parent, and when they combine the new embryo contains a full set of chromosomes.  This process of gamete combination is called fertilization, and takes place inside the woman's body, in the fallopian tubes or uterus.  The embryo then attaches itself to the uterine lining, and is nourished by the woman's body while it develops.  This development takes roughly nine months.

In reproduction through sexual intercourse,  the male and female gametes, the sperm and egg, are united.  These gametes carry just one half of the genetic material (chromosomes) from each parent, and when they combine the new embryo contains a full set of chromosomes.  This process of gamete combination is called fertilization, and takes place inside the woman's body, in the fallopian tubes or uterus.  The embryo then attaches itself to the uterine lining, and is nourished by the woman's body while it develops.  This development takes roughly nine months.