How do I hint at my boyfriend to kiss my neck?

I really like it when my boyfriend kisses my neck, i've even told him this. for a while he did it without hesitation because i had told him i really enjoy it, but now he never does. I keep hinting at it but I don't think he gets it. when ever I'm around him i always move my hair to the side making my neck open, and when I hug him I tend to always put my neck within inches of his lips, and he leans his head down and I keep anticipating him to kiss my neck but he never does. I thought i was being pretty obvious, but evidently not. Is there any other way i can hint at this with out actually saying anything?