Condom (barrier contraceptive and STI prevention)

Materials and types

Modern condoms are produced from several materials. Latex rubber is common because it is elastic and effective at stopping both semen and many pathogens. Alternatives for people with latex sensitivity include polyurethane and polyisoprene, which are synthetic and provide similar barrier protection. Natural membrane condoms — often made from lamb or sheep intestine — can prevent pregnancy but are more porous and do not reliably block viruses, so they are not recommended when STI protection is required. Female condoms (worn internally) are another barrier option and are made from synthetic film. Condoms may be lubricated, textured, or shaped for fit and sensation, and some are pre-treated with spermicide; however, spermicidal agents can irritate some users. For product comparisons see contraceptive options and material differences.

History and development

Barrier methods to reduce conception and infection have a long history. Early forms were made from cloth, leather, or animal membranes in various societies. The development of rubber processing and vulcanization in the 19th century led to reusable rubber condoms, and later advances produced thin, disposable latex condoms that became widespread in the 20th century. Continued material science improvements produced thinner synthetic films and female condoms. For historical overviews and museum collections, consult resources such as history of contraception and educational exhibits at major public health institutions cited at historical collections.

How condoms are used and how effective they are

When used consistently and correctly, condoms substantially reduce the risk of pregnancy and lower transmission of many STIs, including bacterial infections and viruses that transmit via genital fluids. Effectiveness depends on correct application: check the expiration date, open the package carefully, pinch the tip to leave space for semen, unroll to the base of the erect penis or insert an internal condom according to instructions, and use appropriate lubrication. Avoid oil-based lubricants with latex. After ejaculation, hold the condom at the base during withdrawal to prevent slippage and dispose of it in waste. Incorrect use, slippage, or breakage reduces effectiveness. For step-by-step guidance and safety tips see user instructions and product leaflets referenced at safety information.

Advantages, limitations and public health role

Condoms are widely valued for dual protection: they help prevent pregnancy and reduce transmission of many STIs. They are nonhormonal, reversible (fertility returns immediately after stopping use), accessible without a prescription, and found in diverse commercial and public distribution channels. Limitations include the need to apply them before intercourse begins, the possibility of decreased sensation for some users, and a lower degree of contraception compared with some long-acting methods when used imperfectly. Natural membrane condoms provide less STI protection, and improper storage or use can lead to failure. Public health programs emphasize condom availability, education, and combination use with other contraceptives when appropriate; see public health guidance and research summaries at evidence reviews.

Practical considerations and further reading

• Storage: keep condoms in a cool, dry place away from direct sunlight; heat and friction can damage them. See storage advice.
• Allergies: users with latex sensitivity can choose polyurethane or polyisoprene products; consult healthcare guidance at medical resources.
• Environmental impact: natural latex is biodegradable, while some synthetic materials are not; disposable single-use practice affects waste.
• Access: condoms are widely available from pharmacies, vending machines, clinics, and community programs; many organizations provide free supplies and information — for sources see access and support.

Condoms remain a foundational tool in sexual and reproductive health because of their versatility, accessibility, and role in preventing both unintended pregnancy and the spread of many infections. Choosing the right type and learning correct use maximizes their benefits for individuals and communities.