Cybersex, also called computer sex, Internet sex, netsex and, colloquially, cyber or cybering, is a virtual sex encounter in which two or more people have long distance sex via electronic video communication (webcams, VR headsets, etc) and other electronics (such as teledildonics) connected to a computer network.

Cybersex can also mean sending each other sexually explicit messages without having sex, and simply describing a sexual experience (also known as "sexting"). Cybersex is a sub-type of technology-mediated sexual interactions. In one form, this is accomplished by the participants describing their actions and responding to their chat partners in a mostly written form designed to stimulate their own sexual feelings and fantasies. Cybersex often includes real life masturbation. Environments in which cybersex takes place are not necessarily exclusively devoted to that subject, and participants in any Internet chat may suddenly receive a message of invitation.

Non-marital, adult, consensual paid cybersex counts as illegal solicitation of prostitution and illegal prostitution in multiple US states. Non-consensual cybersex sometimes occurs in cybersex trafficking crimes. There also has been at least one rape conviction for purely virtual sexual encounters.