EJ,
I think it must be one of the most heartbreaking things for a survivor to face when he knows that his abuse was not limited to childhood. If he can accept that he was not to blame for what happened to him as a boy, because he was an innocent child, where does that leave him concerning things that happened as an adult? Or in your case, what about the woman who is abused by her father when she is 18 (= adult)?
One of the first things to be said is that while setting arbitrary boundaries for adulthood may be necessary in law, in social reality it doesn't work that way. Any of us who have teenagers will have seen this in action on a daily basis. Sometimes a teenager - even an older one - is incredibly mature, a minute later he/she acting like a child. It's all part of growing up.
But I think there is something a lot more important to say. A child makes some very basic assumptions about the world: I am loveable, valuable and important; the world is a more or less safe place for me to live in; and I cannot be hurt in any really catastrophic way. When the child is abused, all those ideas go right down the drain. The world is NOT safe, and I CAN be hurt in terrible ways. Why is this happening? End of the day, because I am not loveable or important and I don't deserve any better than this.
So while other kids are laying down secure foundations for their adult thinking on sexuality, boundaries and relationships, the abused kid is leading a life in which all that is already in ruins. And once you feel you are just not "worth it" you are in one hell of a dark place. A kid there will do anything for affection, validation and attention, even if it comes only as sweetener from a pedophile who just means to use and exploit the child. I knew by the age of 12, for example, that I was being abused and lied to, but I didn't care anymore. I thought the abuser was all I had left - I was that ruined emotionally.
Things don't change for the kid just because he or she turns 18. All the poison and junk from abuse serves to shape his or her behavior and thinking as an adult, and if you think you are powerless and not good for anything except to service a pedophile, then you are absolutely set up for big trouble. Being an adult doesn't factor into what happens the way it should, or the way it would with an adult who was not abused. I don't mean to haul out the old "abuse excuse" here, but I really think this is central to the whole issue of acting out, which is what your girlfriend did.
You make the following statement that I would like to look at for a moment, and please don't think I am getting down on you here. I would just like to ask you to look at something again:
I don't judge her but this issue is too much for me to handle right now. I have my own problems. I guess what I'm trying to say is that I want to keep her as a friend but I feel awkward around her right now because I feel sexually attracted with her but the thought of her and her dad disgusts me. I can't do it anymore, I don't want to. I'm done with her in that sense.
If you look at this I think you might see that in fact you ARE judging her. She is 18, so she is an adult; she should have said no or avoided the situation.
I would suggest that at 18 or even older a young person who has been emotionally wrecked by abuse is not equipped with the emotional tools needed to set proper boundaries and keep safe. One sees this countless times, and in my own case the only reason it didn't happen was that the men I thought were hitting on me were in reality just good people. A professor at college, for example, helped me a lot and took a personal interest in me; I thought he was hitting on me, and in fact he could have had me in a second. I regarded myself as a worthless drunk and acidhead and I couldn't have cared less what happened to me.
You say you hope to continue your friendship with the woman you were seeing, and that's great. But perhaps try not to judge her too harshly? The experience of having sex with her father must have been horrific for her, and I can't imagine this was something she chose to do. It was incredibly brave of her to tell you and she did that because she trusts you. What she needs now is genuine respect and compassion.
The disgust you feel is natural, but it ought to be directed not at her, but at the man who would exploit and misuse his own daughter like this. To be honest, I feel a lot of admiration for this woman.
Much love,
Larry