Stonewall, the campaigning charity for gay rights, will be running a membership recruitment campaign in the national gay press.
The charity aims to increase its membership base by around 3,000, by highlighting how gay and lesbian people are discriminated against. For example, it is still legal to sack a lesbian or gay employee on the grounds of their sexuality.
The organisation is running a test campaign of 250,000 inserts in a range of gay titles, including Diva and Gay Times.
The campaign, fronted by TV celebrity Graham Norton, urges new donors to become members or friends by signing up to a monthly direct debit scheme.
The campaign, which cost around £20,000, will make more than that amount every year for the next five years, according to Rupert Tebb, Stonewall's development officer.
The new members will also help the organisation campaign to change the law on workplace discrimination and rights for same-sex partners, said Tebb.