In a song by Snoop Dogg - " a bitch i knew" The whole song kind of has a theme of the girls he fucks getting him more pussy through other girls. Can someone explain how that works with examples if any ? He concludes that part with these lines but it just has me confused. How would the first lady "sell a little pussy"

I got a phone call From the motherfuckin president y'all He said, "Snoop Dogg, how could I fuck a bitch And make her suck a dick and not get caught for the fuck of it?" I called and look here, this what you do Make the First Lady sell a little pussy for you

PS i know this is just a song but I'm just curious