Well, he could become a werebeast, which might make spousing... complex... at worst.
This has the potential to create a great story. It needs to be tried.
...and it needs to be done for the sake of SCIENCE as well. Do we know if werebeasts pair up? What about with other werebeasts? What kind of kids do they have? What if they are not the same kind of werebeast?
Too late, I've already deleted that world and I don't feel like trying to arrange for an unfortunate accident to happen to anyone's family jewels. Besides, neither that world nor my new world have any werebeasts anyways.
That said, I thought about this, and here's what we'd need to figure out:
- Do werebeasts regrow their family jewels on the night of the full moon?
- If so, do they retain them once they revert back?
- Will werebeasts of the same type mate with each other on the night of the full moon?
- If so, would they still mate with each other on the night of the full moon if they would not mate in their default forms due to personality incompatibility/lack of marriage?
- If 2 werebeasts have pre-existing relationships with other people, will that prevent mating?
- Will 2 werebeasts mate with each other if they are of different base species?
- Do werebeasts of different types (ie; wereiguana with werecrocodile) mate on the full moon?
- If any of the previously mentioned factors do not inhibit full moon mating, will any combination of them inhibit it?
- Do children conceived during werebeast mode count towards fulfilling the "raising a family" dream for the mother and/or father?
- Even when the parents would never have gotten freaky with each other in their normal forms?
Figuring out the first 2 should be relatively easy: just have a gelded dwarf infected, then check whether he's gelded during and after his first transformation. The others are a bit more complicated.
The first step is to obtain 10 couples, all unwed without lovers, possessing a dream of raising a family and are dwarfs. Couples A, B, C, D, E and F need to be compatible for marriage, while Couples F, G, H and I must be incompatible, and everyone should not be infected until they reach the desired relationship status. Couple A need to become married but prevented from conceiving in their default forms (if it turns out a gelded werebeast regains his his family jewels when he transforms but loses them once he turns back, gelding might be an easier solution than keeping them separate), while Couple B need to become lovers but then separated except for the night of the full moon to prevent their relationship from developing further. Couple C need to become friends, Couple D Long-Term Acquaintances, Couple E Once all everything is set up, each couple must be isolated from each other and only be allowed to interact with their mating partners on the night of the full moon.
If Couple A produces offspring, that is enough to prove that werebeasts mate during the full moon and whether or not children of those unions satisfy the "raise a family" dream. The other couples are just there to see whether or not non-married werebeasts will mate and similarly have their dreams fulfilled, as well as if relationships from their regular form will enable or prevent mating (and if Toady saw any of this coming and has already implemented code for shotguns weddings). If they do mate out of wedlock, then extensive testing needs to be done on whether or not werebeasts will cheat on relationships from their normal form when they transform, and if negative relationships with the mating partner can prohibit this cheating where it would otherwise occur (and if Toady also has codes for divorce). Testing will also need to be done for couples not of the same base species. Once all that is done, every coupling found to produce offspring must be tested again with the one difference being that the partners will always be different kinds of werebeasts.