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The biology of controlling fertilityPhysical contraception

Fertility is the ability to produce offspring. Fertility is continuous in males and cyclical in females. Infertility can have a number of causes and there are a range of infertility treatments that work in different ways. Physical and chemical methods of contraception can prevent fertilisation and pregnancy.

Part of Human BiologyPhysiology and Health

Physical contraception

A visual to show the different types of non-hormonal methods of contraception

Fertility can be controlled without hormones.

These methods include:

  • physical barrier methods such as condoms and diaphragms, which prevent the sperm reaching an egg
  • intrauterine devices (IUD) also known as a coil, prevent the implantation of an embryo or release of a hormone
  • spermicidal agents which kill or disable sperm
  • abstaining from intercourse when an egg may be in the oviduct
  • surgical methods of male and female sterilisation - an example is a vasectomy, where the sperm ducts are cut and tied

Benefits and risks

MethodBenefitRisk
condomsEasy and quick to useCan tear or rip
diaphragmsCan be effective when used properlyNeeds to be put in just before sex and left in several hours afterwards
IUDsCan remain in position for up to 10 yearsNeed to be fitted by a health professional, carries a small risk of causing an ectopic pregnancy
abstainingCan be used successfully, no cost, non-intrusiveIf the timings are not accurate the chance of pregnancy is high
surgeryCan be very effectiveCannot be reversed, and is considered permanent
Methodcondoms
BenefitEasy and quick to use
RiskCan tear or rip
Methoddiaphragms
BenefitCan be effective when used properly
RiskNeeds to be put in just before sex and left in several hours afterwards
MethodIUDs
BenefitCan remain in position for up to 10 years
RiskNeed to be fitted by a health professional, carries a small risk of causing an ectopic pregnancy
Methodabstaining
BenefitCan be used successfully, no cost, non-intrusive
RiskIf the timings are not accurate the chance of pregnancy is high
Methodsurgery
BenefitCan be very effective
RiskCannot be reversed, and is considered permanent