[Age of Reason]

A Man can be sure just as a woman. The babies blood type is the fathers. Just because the evidence of a woman carrying a baby proves it's hers (unless surrogate) the father's DNA is half of what that baby carries (basic genetics lesson)

And we no longer need sex either now that we can fertilize eggs in test tubes.

[Zavien Doombringer]

True, and you can practice that if you like, but I prefer the God given method.