Read Bathing - how often? for more information on this topic. Besides personal preferences, one's like or dislike of smells, scents, and aromas can also be culturally related. Some people do not like the distinctive smell smegma produces, whereas others find it agreeable and even arousing.
Smegma is a cheesy secretion from under the foreskin that acts as a natural lube. The 'dick smell' of an uncut, or uncircumcised, penis is produced by sweat or smegma.