User blog comment:AJDSOUAT/Monster High Freaky Fusion/@comment-32608941-20191202010713

Your probably over thinking it. I don't think Mattel really thought this though. It's really only a skeleton having a kid being a bit weird. The other at least have genitalia and even if it's werid it's not impossible. And a ghost can turn their body physical solid to have physical contact with other's. But yeah the half skeleton part is unusual even more than the other's. But Skelita was also born a skeleton, so maybe skeletons can just reproduce.