The implications of this are serious as demonstrated last year by the distribution of a controversial image of a schoolgirl via mobile phones.
At an advanced stage, he or she can find that their sexual preferences have changed past the point of return and, in doing so, seriously run the risk of marriage or relationship break-up.
Wexford-based psychotherapist Eoin Stephens specialises in addiction counselling and has a special interest in sexual addiction.
When asked if there was a healthy aspect to sexual encounters via the internet, he says: "Some encounters that happen in the realm of cybersex do lead to relationship, and can be just another way of meeting someone.
This can sometimes deepen and grow into a real and emotionally intimate relationship.
Cybersex can lead to a 21st century form of addiction which threatens relationships, writes Nuala Macklin In the 1990s with the predictions relating to the internet becoming mainstream, the potential effects of virtual pornography were somewhat miscalculated.
Feminists of the day warned it would unleash a wave of unprecedented sexual violence against women.
While this forecast might not be completely off the mark, the insidious and destructive effects of cybersex on human relationships are taking a toll.
A conference in Dublin next weekend examines the extent of a growing problem.
Last year Naomi Wolf conducted some informal research among university students and wrote about her findings.
Apparently, young women are finding themselves under increasing pressure to compete with readily available, "virtual" women on the internet.
Also, young men are experiencing a deadening of their libido when it comes to relating directly to "real" women.