What is the ruling of Islamic law regarding unmarried young men conversing with foreign girls sexually through chat rooms, and helping them reach orgasm, and what is the ruling on each party viewing the other naked in these conversations, and is this act considered fornication?

What you have fallen into, in terms of looking and speaking, is among the most emphasized prohibitions. Allah has commanded lowering the gaze and guarding one's chastity, and has forbidden speaking in a soft, alluring manner that leads to arousal. These actions are forbidden, whether direct or via the internet. They constitute the adultery of the eye, hand, and ear, but not the type of adultery that necessitates a legal punishment (hadd). You must repent to Allah and abandon these actions immediately, and fear that Allah may punish you with the like of what you have done. We advise you to stay away from chat sites, seek the company of righteous people, and remember Allah.