After a dry spell with women, you suddenly have more loose ladies than you can handle. An embarrassment of riches.
Similar to "when it rains, it pours"
Guy 1: "I haven't met anyone in a long time. Last night I met 3 girls at the bar when I was loaded"
Guy 2: "When it rains it whores"
When someone suddenly, and inappropriately, changes a text string to sexting.
It was going fine until I got Brianed. He went from "my son has the same legos" to "you can build legos on my dick if you want"