POKHARA, Nepal — Gays, lesbians, transgender people and their supporters marched in a Nepalese town Friday to demand recognition as a third gender in citizen certificates, to allow same-sex marriage and to criminalize discrimination based on sexual preference. Dressed in colorful clothes, laden with beads and other jewelry, they danced to Bollywood music played over loudspeakers as they marched for about 3 kilometers (2 miles) though the center of Pokhara, a resort town 200 kilometers (125 miles) west of the capital, Katmandu.