My boyfriend isn't that affectionate anymore.. why?

We have been together 1.5 years, we also live together. We hardly fight, and have a good time together..but well we used to be the pda couple and now we hardly ever kiss, make out, and such. I don't want him to drool over me or anything but I can't even tell you the last time we made out... we still have sex and that but he stopped "going down there" too... and I am very clean, shaved, etc...I'm not really sure what's going on..Help? I don't wanna come off clingy..but hell I'm really needing some more physical attributes int his relationship..
My boyfriend isn't that affectionate anymore.. why?
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