My stances on this issue are:
The woman should have sole control over the choice to terminate or continue the pregnancy because it is her body. It's unfair to a father who wishes to keep the child, but if they should have been aware of their sexual partners views prior to having sex with them. People forget that there is also the decision to sleep with a specific person involved here, not simply th echoice ot have sex. If you want to prevent a child of yours form ever being aborted, simply make teh choice not to sleep with any woman who would abort your child.
As far as parental responsibility goes, I believe that both parents should have the option of relinquishing any and all parental responsibility, but only if done in a timely fashion once paternity/maternity of that child is established. for the woman, this would be shortly after birth. For the man, this would be shortly after he learns of the birth of his child. this means a woman can go through with a pregnancy, perhaps because the father wanted to keep the child, and absolve herself of parental rights and responsibilities in orderto give the child to the father if she wishes. And vice versa.
However, if the person consents to retaining parental responsibility at that time, the only way that they should be allowed to relinquish that responsibility in the future is if both parents consent to place the child up for adoption. Neither should be allowed to skip out on the child and their other parent.