If yer a lobster-eating lighthouse-keepin' salty sea dog, return that mermaid to their former glory and show off that mermussy!
Eggers said that they based the mermaid's genitals in The Lighthouse on shark labia. But sharks don't have labia? Male sharks have two claspers that function as dual penii though! So in conclusion, the mermaid in the lighthouse canonically has two penii. And thus King Triton has two clits. Go get her Mr. Pattinson-kun!!