ok.. here is my thought. There are two different ways a woman can orgasum. One of them is "clitoril" and the other is "G-spot".. some women only can cum one way .. and some can using both. Sexual history has something to do with it but it depends on the nature of your abuse and the length and even the age of which it happened.
The fact that you can even have sex after being abused at all.. is an amazing acomplishment. Some people that takes months or even years to get over.
As for the "pleasure" from sex, my suggestion would be to incorporate what works for now..(ie: tongue and fingers) .. and let the two of you find that natural wavelength between you. Time is defenately a helpper. Im not sure how long you two have dated .. whether it be months or years .. you just have to let it go. Sex should ne natural .. not forced.. if you have to force pleasure.. I would rethink the relationship.
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