Culture series by Iain M. Banks. There are 10 books. It's about a utopian galactic civilization governed by super AIs. Most of the super AIs are giant spaceship

Culture series by Iain M. Banks. There are 10 books. It's about a utopian galactic civilization governed by super AIs. Most of the super AIs are giant spaceships that transport people. Most people live for 500+ years, and a lot of them switch sexes. People also have drug glands which allow them to instantly administer 200 different drugs via mental trigger.