scientifically plausible pr0n. y'know, I'm going to hazard a guess that for many people plausibility is not a key requirement.

However, I'm like you, and when people get all het up about the mermaid idea, my first thought is always "how the. . ."

Now, if you really wanna write it without creating Merm's Anatomy, you could ask yourself the question how hot can your other character make the mermaid without going below the, um, belt.

thud.