LONDON — David, 49, is not looking for love; he is seeking votes, especially from young Britons who are considered more likely to vote for Britain to remain inside the European Union in a coming referendum.

This David — Cameron, the prime minister of Britain — is not joining Tinder, a dating app, a Downing Street spokesman said on Tuesday, nor has he joined TheLADbible, a popular photo and video site for men 16 to 30. But the prime minister’s office did say it is exploring advertising on both services, and looking for other hip ways to get more young people to register and to vote.

Opinion polls and political analysts suggest that up to two-thirds of Britons younger than 25 prefer to remain in the European Union, and the government wants to do all it can to get them to the polls on June 23, since that age group is less likely to bother to vote than those older than 45, who tend to favor the British exit, or “Brexit.”