Forced to be a Father?

I have been reading a lot about father's rights, in the context of custody and adoption. While searching on the web for articles about father's rights, I came across what is going to be on the Dr. Phil show tonight which is "forced to be a father". The premise of the show is whether or not a father can sign away his paternity rights and therefore escape any responsibility to a child born out of wedlock. Some people believe that engaging in sex puts you on notice that you could be fathering a child and therefore you have knowledge that you could potentially be responsible for that child. Men who don't want that child often feel like victims because they are being forced to be responsible for a child that they didn't want. Perhaps its the child that is the victim in this circumstance. Attached to all of this is the notion that men don't have any rights in the abortion debate. Generally speaking if a woman becomes pregnant and does not want that child, there is absolutely nothing that the father can do to legally stop the woman from having the abortion. The woman actually is under no obligation to even tell the father that she is pregnant. Is this fair? Some people would argue that it is, some people would argue that it isn't. Either way it adds one more element to the paternity and abortion debate. I'm interested in anyone's thoughts on this subject and/or comments on the Dr. Phil show on this issue.

Dr. Phil Show: http://www.drphil.com/shows/show/1150