Medical Definition of Safe sex

Safe sex: Sexual practices that do not involve the exchange of bodily fluids, including blood, sperm, vaginal secretions, and saliva, to avoid AIDS and other sexually transmitted diseases. The term safe sex is generally used to mean sex without penetration or sex using condoms or other barrier measures with consistency.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=11151
Last Editorial Review: 6/9/2016