I don't think it's wrong. I mean, nature is going to take its course no matter how you TTC, at the end of the day it gets the job done right? I have heard about the whole timing BD around ovulation thing and I think it's interesting. We BD'd several days before I ovulated and we got a girl (which is what I wanted!) and I guess the science behind it makes sense.
I don't think it's wrong to hope for a certain gender either. I think everyone does it, or almost everyone. I REALLY wanted a girl, but overall of course I wanted a healthy baby so I would have been happy with a boy too. I guess