Compusex

One of the more bizarre aspects of America's love affair with the personal computer is the growing popularity of CompuSex. This is a new form of erotic entertainment in which consenting computer owners exchange X-rated messages over the telephone lines […]

Source: wiktionary

In one case, cited by several sources, a woman became so involved as Joan's compusex lover that she was on the verge of leaving her husband.

Source: wiktionary

We now have cybersex, cyber-stalking, cyber-rape, cyber-victims, cyber-porn, cyber-voyeurism, compu-sex, sex chat rooms, sex newsgroups, sex bulletin boards, camcorder sex, virtual sex, cyborgs, blogs, MySpace, YouTube...

Source: wiktionary