Straight: Alice and Bob have a one-night stand. Alice finds herself pregnant, but Bob is completely out of the picture.
Exaggerated: Bob has several children, by several different women, whom he never again contacts or pays child support money to. In fact, he is always on the move, changing his name, so that the mothers of his children won't be able to find him.
Downplayed: Alice and Bob were in a relationship, but they break up. Bob gets visitation rights, although he wishes he could be a bigger part of his kids' lives.
Alternatively, after the baby is born, Alice is nowhere to be found.
Alice becomes pregnant, and Bob stays with her.
Alice and Bob break up during or shortly after Alice's pregnancy, but Bob gets visitation rights, and cherishes every moment he has with his kids. And he is certainly good about paying child support on time.
But then they have a fight and break up, and Bob never contacts Alice again or sees his child.
He doesn't get to see his kids as often as he'd like.
Bob is surprised to find out that he even has a child.
Bob gets Alice pregnant. They haven't even had sex.
Zig Zagged: ???
Bob has no children by any of the women he's slept with.
Bob gets Alice pregnant, but does not leave her or the child.
Bob didn't sleep with Alice, therefore if she is pregnant, it's not his.