My DS is 3 and my DD is 5. My DS is very affectionate, every morning he comes and gets into bed with me (at my side not in the middle of me and dp) and then hugs me and kisses me until I wake up. When I am on the computer like now, he insists on sitting on my knee which is very hard when you are trying to type!!!
My DD has never really been one for cuddles, only when she is tired or ill. When she was DS's age she always used to sit with dp and cuddle him before she went to bed.
In our case its definitely Mummy's boy and Daddy's girl, is everyone's kids like this?