Your site encouraged me to search again for a film that I saw in the 90s on TV, when I was 5. I woke up in the late evening, so I went for my dad to read me another bed time story and maybe to get a cookie. He watched a film on TV and I got a glimpse of it while I walked up to him. This one scene stuck in my memory. There was some weird bad robot with white hair and a good robot with black hair and – for whatever reason – I thought the bad one was collecting breast milk.
So, today I searched differently and went through every horror film made in the late 80s and early 90s. It turned out that I saw "I Come In Peace". In the particular scene that I saw, the bad not-robot-but-alien had a female victim. I guess since the bad alien ripped open the shirts of its victims and pumped white liquid into and out of their bodies, I thought it had to be breast milk. Now that I know that the liquid is supposed to be heroin and endorphins, the film seems to be less fucked up than I thought it was. The trailer also seems to be more trashy than horrifying, but for a kid it was really scary. Maybe someone else suffers some Kindertrauma from that one.