San Francisco: Dozens of gay couples were married Monday after a landmark ruling making California the second state to allow same-sex nuptials went into effect.

At least five county clerks around the state extended their hours to issue marriage licenses, and many same-sex couples got married on the spot.

"These are not folks who just met each other last week and said, 'Let's get married.' These are folks who have been together in some cases for decades," said Kate Kendell, executive director of the National Center for Lesbian Rights.

The May 15 California Supreme Court ruling overturning bans on same-sex marriage took effect at 5:01 p.m.

The really big rush to the altar was not expected to take place until Tuesday, which is when most counties planned to start issuing marriage licenses to gay couples. Hundreds, perhaps thousands, of couples from around the country are expected to seize the opportunity to make their unions official in the eyes of the law.