Magic vs. Science

[Amahain]

As others have said, magic allows for more suspension of disbelief, so most of my stories use that as a trigger.

I only wrote one sci-fi TF where the trigger was an alien virus and I got stuck trying to figure out how to make it scientifically plausible while still causing effects that would suit an erotic TF story. I ended up rewriting the story several times, making it far more convoluted than I had originally planned (problem: how to make a scientifically plausible story about a virus that evolved on a separate planet that is able to turn humans of one particular sex into lust-filled xenomorph knock-offs - it would have Darwin scratching his head for sure.)

This isn't to say a good sci-fi TF isn't possible, but I feel it requires the writer to be deliberately vague about the science. Magic, on the other hand, can have whatever rules the writer wants it to have, and is much more flexible.