Favorite sex position

I've only done the 3 most common sex positions: doggy, missionary & cowgirl. My partner & I have done these in a car, so not the most comfortable to begin with. And while cowgirl position in a car is slightly uncomfortable for me (on the part that we usually do so in the driver's seat & I don't have anywhere to plant my feet), I think it's my fave.
-I also like being a little dominant of guys sometimes. Although, my partner hasn't let me try that with him. But I don't think he likes it very much because he always switches to missionary real quick. I'm thinking also maybe because some guys don't like feeling dominated & feel emasculated during sex if that happens. (Aside from what's said above, of the 3 positions, it's also the most comfortable to me). Opinions?