Condoms reduce the risk of both pregnancy and STDs. They are not 100% effective in preventing either pregnancy or STD transmission, but do significantly the reduce risk of passing on HIV, Chlamydia, Gonorrhoea, Hepatitis, Syphilis, and probably Trichomonas and have some effect on the risk of passing on Herpes and Genital Warts. Heterosexual couples may choose condoms as their regular contraceptive or in combination with other contraceptive methods. Many contraceptives are more effective at stopping pregnancy than condoms, and so many couples double up, choosing to continue with condoms to reduce the chances of catching an STD but also use another contraceptive that is more effective at preventing pregnancy.
For information about Contraceptive Choices click here.