abnormal. maybe he is gay or he have weird fetish. Good thing that u stop halfway there. please think carefully before you proceed doing something that u are going to regret later. u have not done it yet so better dont start. if u think u cant stand it anymore, go for counselling first. if not, have a serious talk with him and decide what to do. either he do his part or u both go separate way. dont waste your time being in an unhappy marriage. especially if u still dont have kids.