Calendar Girl

Mostly targeted at straight men, they follow in the tradition of men's magazines featuring centerspreads, monthly nude features and swimsuit issues like Playboy and Penthouse and later offshoots. The Pirelli Calendar is famous.
Male nude calendars
Mostly targeted at women, they follow in the tradition of women magazines like Playgirl that publishes centerspreads and monthly nude features of men. The men featured are at many times erotic and sometimes homoerotic.