The Chain Reaction(1996)

Johan, an innocent and cute young guy, enters a gay bar for the first time. The bar's quiet and Johan is clearly transfixed by the barman. He can't take his eyes off him. His trance is broken by the arrival of the barman's boyfriend who is also young and pretty, but obviously more confident than the naive young Johan. At first he's amazed at their sensuous kissing across the bar and then he's jealous