The speaker talks about their own mind in a blunt, teasing way, calling it a "whore." It's a rough word, and it suggests a mind that is restless, easily tempted, and always ready to go off with whatever catches its interest. Then comes the twist: this mind has never had better company than it finds in books. Reading is where its appetite is finally met.
The second stanza brings the scene into the bedroom. An evening in bed with the mind, which seems to mean an evening reading and thinking, is "one of full content." That phrase works two ways. It means satisfied, and it also hints at being full of content, meaning words and ideas. The title, "Content provider," adds a wry note, since it sounds like a modern job label, yet here the speaker is the one being fed.
The mood is playful, a little cheeky, and deeply comfortable. Reading is treated as an intimate pleasure, and the speaker seems entirely at ease with it.