Why would a guy start singing a dirty song playing in the background while we're together?

We were spending alone time together today and Benny Benassi ''Satisfaction'' song was playing in the background and he started singing while looking at me and I started blushing. If you're not acquainted with the song, it goes like this: ''Push me and then just touch me
Till I can get my satisfaction''

He often stares at me and caresses my back when we're together but he never attempted to kiss me. Yesterday he also said my outfit looks cute. Should I assume he's flirting with me? Should I make a move on him?

Why would a guy start singing a dirty song playing in the background while we're together?
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