However, this tendency to keep knowledge of one's sexuality within the gay community changed during the Civil Rights era, Chauncey said.
"The gay liberation movement was part of a generational shift," Chauncey said. "Many [of younger activists]had little contact with the other gay world.
"These activists thought that the closet was isolated and saw coming out as a new cultural imperative," he added.
After the speech, Chauncey expanded upon his thesis in light of audience members' questions and criticism.
Carey V. Johnson, a masters student at the School of Public Health and gay activist, said he came to hear Chauncey speak because he enjoyed Chauncey's 1994 book and wanted to hear him in person.
"He really pulls in the audience, opening little doors to the past," Johnson said.
The event was organized by the Harvard Gay and Lesbian Caucus (HGLC).
Robert W. Mack '71, a HGLC board member, said he was pleased by last night's attendance and by Chauncey's remarks.