People forget that sexual needs, just like anything else, is prioritized. Somebody might enjoy driving in his car, but might enjoy surfing more, so he surfs more. Just like that, somebody might enjoy gaming more than spending time with a significant other. It's pretty simple, really, and not testimony to how 'sad' anyone's life is at all. Don't condemn anyone for having different needs.

There is often also a reason why somebody might enjoy something more than spending time with a significant other, and that more often than not, really says more about the significant other than the person him/herself. :P