On the subject of lactation sex, one experience comes vividly to mind. Some years ago I had a gf who lactated on occasion. She had given birth 4 or 5 years previously but for some reason the taps never shut off all the way. And she had such lovely breasts! One night early in the relationship we were enjoying some medium raunchy sex. At some point she ended up on top of me and I started orally working on her nipples because, you know, that is something I like to do. All of a sudden, my mouth starts to fill with her white stuff. It was a huge turn on for me because I felt like I was pulling something out of her body and taking it into my own, and she loved me for it. My feeling of empowerment was reinforced, no doubt, by the fact that her lactation coincided with the onset of her first round of orgasms.
Hot sex aside, I am not a big fan of milk unless it is 2%, very cold and at some point came out of a cow. Human milk tastes kind of gross to me. Wouldn't want it on my corn flakes. As for the gf, she loved to suck cock but was not all that wild about the taste of semen, which of course she always swallowed. I figure this made us pretty much even.