Gay men are male homosexuals. Some bisexual and homoromantic men may also dually identify as gay, and a number of young gay men also identify as queer. Historically, gay men have been referred to by a number of different terms, including inverts and uranians. Gay men continue to face significant discrimination in large parts of the world, particularly in most of Asia and Africa. In the United States, many gay men still experience discrimination in their daily lives, though some openly gay men have reached national success and prominence. In Europe, Xavier Bettel currently serves as the prime minister of Luxembourg; Leo Varadkar serves as the current Taoiseach and head of the Government of Ireland since December 2022 for the second time (he had previously served as Taoiseach (Prime Minister) from June 2017 to June 2020); and from 2011 to 2014, Elio Di Rupo served as Prime Minister of Belgium. For a time, the term gay was used as a synonym for anything related to homosexual men. For example, the term gay bar still often refers to a bar which caters primarily to a homosexual male clientele or is otherwise part of gay men's culture. By the end of the 20th century, however, the word gay was recommended by LGBT groups and style guides to describe all people exclusively attracted to members of the same sex, while lesbian referred specifically to female homosexuals, and gay men referred exclusively to male homosexuals.