One man's sin is another's possible cash cow

I love my cousin and respect my family's choice of life, but I couldn't help but immediately think of a general plot for a harem manga/anime series when he posted this link.

I can already think of a few series that involve Devils and demons showing up to tempt the hormone-ravaged protagonist, even one that literally meant the end of the world if the main character gave into temptation. Hilarious series that I can PM you about if you're curious.

Maybe there's someone who's artistically inclined that could help me make a new series?