I said it with the last series of artistic nudes of Layla: it is literally hard to stay concentrated on photography when the model is so very playful and her mind and her thoughts are more than obviously mainly about how she can distract you from your photographic project. It's fun for her when she achieves her goal (it's not particularly difficult though, you know I like to be distracted...).
Not that it's enough when she reaches it! The energy of youth seems boundless and her will to get out even more afterwards, just to see where the limits of her seduction skills are, is only opposed by my now honestly no longer so very youthful energy reserve.
But you do what you can :-)