I really need some advice on what to do about the situation that I am in. Please read this with an open mind and leave all your misconceptions behind. Trust, jealousy, cheating or lack of love are not the issues here. I need help figuring out if I should let go of the feelings (and how) that I am having or to pursue them. Here is a brief background on my relationship.

My fiance and I have been together for close to six years. I am deeply in love with him and he is in love with me. I know that he is the person that I want to be with until I cannot be with anybody else. I lost my virginity to him and I have always wanted him to be my only. We have a close bond together because of the fact that I have never been with anyone else. I have come to realize that my sex drive is a lot higher than his. I want to try new things that he is not comfortable with. We have an agreement to have sex at least twice a week because sometimes we will go a month without having sex/making love. The weird thing is that I know he is very attracted to me (I am not an unattractive person). Most girls that he has pointed out to me to be attracted to has some feature of mine. As hard as it may seem, the fact is that he is not a sexual person.

Recently, I met a man (Ken) that I find very attractive and very pleasant to be around. Being that we are not a jealous couple, I told my fiance about my feelings toward Ken. To be more specific, I told him that I wanted to have sex with him. With Ken, I know that I could not have what my fiance and I have. I am mostly sexually attracted to him. Ken has made it very clear that he is not only sexually attracted to me but is slowly working towards winning me over in order for me to leave my fiance. My Fiance knows of Ken's feelings towards me but has allowed me to go on a couple of dates with him because unlike other teenagers, I never experienced dating.

I was hoping that after getting to know Ken a little more that I would slowly loose interest in him. Going out with him has confirmed the fact that I could not have him as a partner for the rest of my life because of our different views on life. But, I cannot get over the lust that I feel. I do not know how to make it go away. I do want my fiance to continue being the only person that I have ever had sex with but at the same time I want to have sex with this new man.

If I decide to have sex with Ken, it will ruin my relationship with my fiance.
I cannot end our relationship just so I can have sex with another man. That would be horrible of me. It would mean that I do not value what I have now, which would be a lie. I want what I have now and do not want to let it go. But, I also want something that I do not have and I know I cannot have both because my fiance is not alright with it.

My wish is for my fiance to be ok with me having sex with Ken because if he was in my situation I would have let him have sex with another female (I am not just saying this to make me look like the better person, this has actually came close to happening-but plans changed). He understands that I would let it go the other way if he wanted it but HE CANNOT GET HIMSELF TO ACCEPT ME BEING WITH ANOTHER MAN.

Anyway.. Please tell me your thoughts.

Am I wrong to feel this way? Is it my fault?

Please no guilt trips. I am human and am trying to handle this the best way that I can right now. If it was easy for me to just make myself stop feeling this way, I would have done so. I need a response that will make me see things and think about things in a way that my mind is incapable of doing right now because of all the cloudiness. I have had some great responses so far. Thank you everyone.