Some interesting musings from Ben Casnocha. Apparently celibacy is the best option if you really want to get a lot done:

My thesis is that In a Relationship is just as much of a time and energy sink as Single and Looking. There are various reasons, but one big one. With Single and Looking there's a great deal of emotional energy spent contemplating your lack of dating success, there's stress around existing dates, and of course, wondering, "Is she interested? Am I interested? Do I play like I'm interested?" You spend a lot of cycles thinking about your dating life even when you're not going on dates.