She's in the baby-making phase of her cycle.  

Those lips do make one's mouth water

OMG, that photographer caught a moment. But then again, it might be completely staged, even though this kind of dripping is totally possible. From my creative perspective, I could totally see the photographer setting this up with a syrupy liquid to mimic real juices. Either way, it's beautiful with the lighting, her lips, the strings of juice and that one bead dangling. This is very nice photography work.  

nycad