As the numbers of college-going males dwindle, gender is a consideration in maintaining diversity. But admissions officials are cautious in their approach. At Dickinson College in Carlisle, Pa., admissions officials gave a nudge to males on the margin for several years, which helped increase the male share from 36% in 1999 to 45% in recent years, says Robert Massa, vice president for enrollment. At the same time, it tried to boost its male applicant pool by marketing to males, playing up sports opportunities and even choosing bolder colors in recruitment brochures.