There are two parts to this that I'll address separately.
Hmm, then I must have done something wrong. I activate the futanari module when creating the female character. And I thought that the strap-on should be. What needs to be done to make it work properly then?
The Futanari module does not affect anything on a character's modeling. Its functions are entirely internal. It enables certain mechanical gameplay features, such as interfacing with the Pregnancy module (note: this does
not enable vanilla pregnancy on its own!) or enabling the futanari actor to take initiative during H. You won't get any visual effects from using it.
Is there a mod that replaces a girl's strapon ... with a real penis?
You've got two options here: The "Override" addition and the "Fleshy dildo" replacement.
The override is what the folks above this post are talking about. It is a direct addition to an individual character's model and has to be designated in the Archive Overrides settings in the AAU Maker interface. It is a static model; it is stiff, not malleable, and will often not align well with the other actor during H, but it does offer a better visual. It is entirely separate from the dildo, and so you'll need to turn the dildo off during H to fully see it (default key for this is '6').
The override is organized into six options that will depend on the height of the character and whether or not you want it to have testicles.
The fleshy dildo is what it sounds like: A mod that replaces the default dildo with one that looks reminiscent of a penis. This doesn't offer the anatomical visuals that the override does, but because it is technically just a modification to the dildo (i.e. something that is already designed to work with H poses), it will align much better during H (with a few exceptions, notably with custom poses offered by MCP/JMCP). By virtue of replacing the dildo, this is also not unique to any single character and instead will be shared by
any actor that would otherwise be expected to "wear" it during H; you do not set this during character creation. As an added bonus, it is also affected by the "length" and "girth" sliders in AAU's "Body Slider" tab in the Maker, though for some reason you sometimes need to reset the dildo by deactivating and then reactivating it to see the change.
Note: This was originally made by Futaboy from Hongfire many, many years ago. As a result, it is only compatible with whatever clothing items were available at the time (i.e. newer clothes, such as the those from the CCC, will still display the old dildo during H if the character is still clothed). If your actor uses a newer outfit but you still want the fleshy dildo, currently your only option to properly display it during H is to fully strip them of their bodywear (leg and footwear is, as far as I've seen, unaffected).
I've attached screenshots of what both of them look like during H. For the record, they aren't incompatible with each other. Having a character using both won't break your game, per se, but it will look rather odd if the dildo isn't turned off.
For the override, unless you're interested in learning how Archive Overrides work, I agree with the posters above me that finding an existing futanari character and simply modifying it is the simplest way to access it. There's a character named
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that circulates for this very reason.
For the fleshy dildo, I have an old copy of it from Hongfire available for download on my
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. Extract the archive and place the "!fleshydildo" folder in AA2Mini\data\sets\.
Edit: Fixed a typo.