What your granddaddy used to masturbate to.
Bill still had his old pinup collection, covered in semen.
The term "pinup" was coined during World War II when American soldiers would pin pictures, usually drawings and sometimes photos, of beautiful women to thier bunks or in thier aircraft. Today, the term "pinup girl" refers to models for publications like Playboy and Maxim. However, there is an underground culture of retro-inspired pinup girls that still dress and model like the original pinup pictures. Pinup models, past and present, are all major sex symbols like Betty Grable and Marilyn Monroe, and famous pinup artists include Vargas and Elvgren.
Marilyn Monroe was the ultimate pinup girl!