What do i do about a straight friend always flirting and saying very things only around me?

I am a gay male and I have a really good straight friend who slaps my rear, pokes me in the sides, gropes my shoulders and neck , grabs my pecs , moans when he's around me, winks at me all the time and is always talking about needing with a girl while he's doing all of this to me . He says that he is not gay, but i'm really putting all that into question. This guy is seriously throwing me off guard! Any suggestions???