I disagree. I think curiosity is a drive. A drive that can be as powerful as ones sex drive and more so. We all experience this drive intensely as babies and children. We crawl, suck, feel and examine our environment compulsively in an effort to pin down the structure and rules of our world. As children we ask why the sky is blue or the grass green. It just seems to me some of us seem to grow out of it when puberty hit. Only some though. I know I never did. My curiosity grew and found new ways to apply its self.
By the way I imagine any relationship that is firm and open (rather than just based on sex) is going to have an intellectual dimension. Perhaps not on the level of say Einstein who used to discuss theoretical physics in bed with his wife (who was also quite bright) but some level of shared curiosity or creative interest must surly present its self.
Learning can be a pleasure. Being creative also. Learning together with some one you love must be very satisfying and I'm quite certain getting creative with some one you love must be great fun