drive after a baby?

i had my second baby 4 months ago and ever since i have absolutly NO drive wot so ever! i new it was normal at first but i was expecting to haveit back by now an so far there are no signs of it ever returning! (not that it was very high to start with). we`v tried it twice since the birth but i didnt enjoy it at all it was painfull and i only agreed to it cos i knew id have to do it sometime plus my partner had been very patient. i honestly have no interest in it and could quite happily go the rest of my life without it! this is how i feel but how can i expect my partner to!? the thought of makes me cringe it hasnt affected our realationship so far but i dont want to feel like this forever will it ever come back?