free cookies for song name

recently i heard a song on a radio and it was awesome, but i don't know the song name. it's quite old and famous :/

so it's a r'n'b song where some guy sings through the song something like "who fuckin tonight" or "who fuckin all night" or something like that, and also a girl sings some lyrics there...

plz help me!! what's the name of the song???