The most usual form of piercing in the world today is ear piercing. Our society easily accepted ear piercing as common practice and it has become more normal for both sexes than it once was. Ear piercing can be as "shy" as a single hole in one or both ears or be as "prominent" as holes along the entire rim of the ear.
While currently fashionable, multiple piercings are nothing new: the University of Pennsylvania Museum exhibits a 4000 year-old clay figure with multiple-pierced ears! As almost with any body piercing jewelry you can use regular earrings, barbells or studs. Even very conservative person will not mind small gold stud as a second earring.