I never thought about it. My 1st wife never did that. After my wife died I married my Bengali maid. She asked me suck it when she had excess milk after feeding our baby and it was causing great pain to her. It started like that and I got really addicted to it. Now I can't sleep without sucking milk from her boobs. I have drank milk from her boobs along with my all three children I had with her. My second wife had feeded milk to me more than my mom did to me. Now she is not getting milk so she is using a feeding bottle which she inserts in my mouth along with her nipple and feed me daily night before sleeping.