im a female and i have the same problem the author of this thread has.
im very jealous and was a virgin until the current bf.
hes been with 4-6 (i forget) other girls
im also very egotistical and the thought of him comparing me to these other girls makes me angry (dont know if he really does or not), i know thats a personal problem i shouldnt be taking out on him, but i dont. its something i keep to myself.
i have told him before jokingly hes a slut some people cant grasp the "humor" in that, but to me it was a moderate relief for me to sort of let him know my feelings towards it. (the discussion didnt really go further after that, but it was sorta the icing on the cake for my fury)
it bothered me a lot for the first year and a half of the relationship but now my anger is slowly diminishing, it probably will for you too once you realize shes dedicated to you and only you.
girls can be jealous too 8)
its not something i recommend to dwell on, it will make you more furious thinking about it.
my bf didnt know me when he was sexing these other girls, so he didnt know i was coming along so he didnt save himself, the same can be said for your gf.
i wouldnt say i "saved" myself for him, i just didnt feel the need to do it with anyone up till that point.