Skin magazine, an erotic or pornographic publication featuring nudity is often associated with the likes of Playboy and Hustler, but there are many synonyms for this specific type of magazine. Terms such as 'adult magazines' or 'men's magazines' are sometimes used, but more specific terms are also in use, such as 'glamour magazines,' 'girlie magazines,' 'pinup magazines' and 'lad's mags.' In some cases, the publication may focus on specific themes, such as 'erotic art magazines,' 'leather fetish magazines' or 'tattoo magazines.' Regardless of their specific focus, such magazines have become less popular in recent years as online pornography has offered a more convenient outlet for many.