Note: I'm pretty sure the censor bar is NOT covering her closest nipple in the brief clip at 1:10. I mean, not that I notice those sorts of things.
This is clip from a 1997 VHS video titled 'How To Have Cybersex On The Internet'. Haha, I owned that one. A real cult classic. Apparently the protip on how to cybersex involves entering a chatroom and telling a stranger, "i'm very horny and im looking for some good cybersex are you interested?" If you're lucky, they'll respond, "yesssssssssss" like the make-believe stud in the video. Then it's just a matter of rubbing yourself/beating your meat against the desk until it's time to smoke a cigarette and take a nap. Bonus points for signing off before your partner finishes.
Keep going for the video, maybe you'll learn a thing or two.
Thanks to Michael M, who's still convinced cybersex involves sticking your penis in the hole of the CD-ROM tray. Ahahahahhahaha! No, Michael, that's called virtual sex (and it's awesome).