Yes, it's perfectly normal. If they know how to do something, they'll occasionally do it even when it's not selected as their preferred skill. That's why it can be so risky to have male breeders - there's no stopping them once they know how!

In like 8 children my tribe had (several different couples), none were males. Is it normal? Now my game is screwed since no males survived and I have a women-only tribe.

Sometimes, just as in real life, there's an imbalance in the gender of babies that are born. In the game that I'm currently playing on my LifeDrive, I've had the opposite problem. For most of the game, I've had only one female, and I've had to carefully take care of her and manage my population to prevent an all-male population. Normally the population isn't quite THAT unbalanced.

All is not necessarily lost, though. There are 3 Island Events that could bring just what you need.

Monogamy is not true!

I have had 1 woman after leaving the hut with one guy seek the affections of another instantly. She has been amerous with all 3 males of age and has had 6 children from 2 men.

One time after some odd dragging she entered the hut with 2 men and came out with her 7th child. So nobody knows the father of that villager. My oldest suitor Juro even produced offspring with 2 of his own daughters just before dying. THis is kind of morally corrupt don't you think?

I don't think a man should be able to produce children with a female and then produce children with his own female offspring 18 years later.

I decided to train one of my men in breeding. I came back 2 hours later, and he had fathered 8 offspring! So then I decided to train some new fathers, and rotate them to mix up the gene pool. None of my villagers seem at all monogamous.
I can't keep track of who fathered who...

How do you guys keep track of who's offspring is whom's? There are so many (I'm up to ~25) that I can't even keep track of who the partners are, much less the kids! Especially since many of them look alike. It would be helpfull if there what a "family tree" screen. Of course, with all the polygamy I don't think one would even be possible!!!