Slightly of topic, but they also make DNA tests to determine paternity illegal without the consent of the mother! I recommend all new fathers to do it quietly (without ruffling any feathers), costs basically nothing (< $200) as compared to the pain/devastation finding out 10-20-30 years later that the children you raised were not yours. Doesn't happen a lot, but can happen to anyone. In France you'll go to jail for doing this, or at least have to create a scene with your partner.