safe sex

sex using a condom in order to prevent pregnancy and the spread of infectious diseases

Safe sex (also called safer sex or protected sex) is a set of practices that are designed to reduce the risk of infection during sexual intercourse to avoid developing sexually transmitted diseases (STDs). Conversely, unsafe sex refers to engaging in sexual intercourse without the use of any barrier contraception or other preventive measures against STDs.
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Safe sex n. Sexual activity in which safeguards, such as the use of a condom, are taken to avoid acquiring or spreading a sexually transmitted [more]Safe sex - Community and Resources

Noun
1. sexual activity (especially sexual intercourse) with the use of measures (such as latex condoms) to avoid the transmission of disease (especially AIDS)
(hypernym) sexual activity, sexual practice, sex, sex activity

safe sex, sex using a condom in order to prevent pregnancy and the spread of infectious diseases