My "Grandfather" Clause

A very interesting subject has come up in conversation a few times over the last couple weeks, and I have presented a clause, if you will, on this (although I know that clause really isn't the right word for it, I am going to use it anyway because I like the way it sounds). Basically, what I argue is that if ever a girl has been "yours," then in a way you always have the right to make her "yours" again, even if just for a night, whether or not she has a boyfriend (of course this is with her consent, I do not endorse most forms of rape). I know this needs clarifying, so be patient. Now, I understand that you can never really "own" a person, and that is not what I mean by her being "yours." I mean it in the sense that your heart belonged to her and hers to you. Sappy, a little, but we have all had this experience. Now what I believe is that if you have had this with a girl, then she was yours, and even if she now has a new boyfriend, there is nothing wrong on your part if you hook up with her or even steal her back. The argument being that she was yours first, and you have a Grandfather clause with her. There are obviously exceptions to this, as there always are. But the reason this exists is because it is wrong to hook up with a girl or steal a girl who is with another guy. I have been cheated on before, and let me tell you, it SUCKS. So I would not want to make another guy suffer through that, especially for something trivial like a hook up. However, if she was mine first, I wouldnt feel bad, because, like I just said, she was mine first. Ive talked to a number of guys about this and everyone has agreed with me, mostly because everyone has at least one girl that they feel will always belong to them in some small way. I have two. And what I am trying to say is that if I hooked up with either one of them while they had other boyfriends, I wouldnt feel bad about it. And if another guy did it to me, Id understand where he was coming from. But I am curious what other people think about this. However, I dont want people trying to prove exceptions to me, because I know they exist. For example, if one of my two were dating a friend of mine, I wouldnt do it, because other rules come into effect. And make sure you understand what I am saying before you argue or agree with my point. I understand this point of view may not be the most virtuous, but I believe there is a selfish part in most all of us that feels this exact way.