You know what, I had a knee-jerk reaction to this question but after reading the whole thing and thinking about it a bit more, I can see it both ways. Great points about the docs and teachers, by the way.
Still, I think I can answer this one by bringing it back down to my general philosophy - it's all good as long as all parties involved are aware and accept the situation.
I don't think you need to condemn yourself to a life of solitude, simply inform anyone you start to get serious with just how important your career is to you and you don't forsee any romantic relationship taking over as the more important role in your life.
A couple of things to keep in mind though, we all retire eventually... are you okay with not having someone to sit on the porch with and enjoy the last years of your life with? Also, when you have kids, they really do need to hold higher placement in your life. Careers are important and never give up on your passions, but don't forget that if you have kids, you're taking responsibility to shape another's life. And one more, I think even if we are greatly passionate about anything in our lives - career, hobby, ANYTHING, we still need to find a balance. We can do great things in this world, but I think there's a lot to be said for being well-rounded. Make time for each part of your life - it may mean needing to become more organized or just realizing that you can't do it all and letting one give way to the other sometimes - but not all the time.
Best to you!