In the Harry Potter universe you can find out the size of someones dick by drinking polyjuice potion with his hair in it.

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The potion takes about three months to brew iirc. So it might not be the most time efficient way to do so.

Blaekhus

If you’re trans questioning you could do it with a friend of the opposite sex to see if you feel more comfortable like that. But don’t tell Rowling I suggested that

asteroidbook345

Ron: Here I got one of Dumbledoor’s pubes. Harry: How did you get one of those?… Ron?

yamaha2000us

Imagine a bi/pan hooker in the HP universe who keeps a vat of polyjuice on deck so clients can shag whoever they want with no recourse.

MahlonMurder

You could also see what that person ~~looks~~ that you ~~like looks like~~ have a crush on looks like.

Yesitmatches