If we're only talking about personal life and personal use of the PC while at work (since I couldn't work without a PC), and if we're going on the assumption that the sex would be essentially available at any time that I wanted it and pretty much HOW I wanted it (hehehehehe), then I'd give up my computer in a heartbeat.
However, if we were talking about my REAL life, where the little bit of sex I've had wasn't all that great, and where all I'm getting now is with myself, and on the assumption that I wouldn't necessarily be GETTING sex after making the choice, only that I'd still be ABLE to have sex but not use a computer at all...then I'd have to say give up sex.
Basically, since this seems to be related to another post which said 8% of men preferred their PC or cell phone to sex: if I was married or had a steady gf/bf, and had a choice, I'd choose my spouse/significant other over the electronic gadgets.
Real life is much more interesting and fulfilling than the digital realm, even though it may not seem that way to some people at times (it certainly didn't to me several years ago).