The problem with many BK movies is that almost all of the cum is wasted. It goes on the floor, or somewhere. Think of it - if 50 guys ejaculate and each ejac is at lest 3 ml, then the ultimate result should be about 150 ml of cum, or about 5 ounces of it on the girl's face, body, and in the glass. Instead, we see only a fraction of that. I'd love to see about 1/3 of the guys cover the gal's face and tits, and the rest cum directly into a wide-mouthed glass. The gal would drink the whole thing at the end.
Furthermore, I love the few BK scenes where the gal masturbates to orgam while the guys are shooting onto her. That's just about the ultimate turn-on.