Why am I so promiscuous when I don't enjoy ?

I lost my virginity to a 24 year old man when I was 15. I changed my mind beforehand but he did it anyway. After that I became very promiscuous. I'm 21 years old now. I stopped being able to enjoy unless it was with myself. Masturbation is the only way I can feel truly turned on or reach . I have gone and continue to go through periods of time where I have with several men in a small amount of time. For the past two years it has only been with men I have already been with in the past. I'm married now, and I love my husband. I really do. But I still have urges to go sleep with other men. Why am I like this? I don't want to cheat on my husband. I don't even want to want other guys. I just don't understand why I want to have with other people if I don't even enjoy .