This raises so many questions:

Does the one who didn't get married get jealous?

When the guy fucks his wife, since they share a pussy, if the other one doesn't want it, is that rape?

If the other one wants to start seeing a guy, is the husband going to get pissed that his wife is cheating on him?

Assuming each head has different DNA (I imagine it would be the same in the same body, but they could be a chimera) if they get pregnant and it is actually the baby of the unmarried one, what kind of drama would that cause?

What if the baby bonds more with the one who is not the intended mom?

...don'tsayit...don'tsayit...don'tsayit...

"Man, I bet she gives great heads."

...Damn it.

I've actually met those two. They lived in my home town. I think they're schools teacher(s) now.