"Eh! Why I cannot have sex har? Double bed there and privacy maintained right?"
"Erm, sorry sir, Singapore is still a conservative society that values the conventional family unit AND place for sex. Sex at 30000 feet above the air is 'unconservative'. SIA, being Singapore's national air carrier would like to followsuit. Thus, I regret to inform you that the rules are still no sex in the A380"
"But we're doing it in private, right? Not that we'll keep banging against the door or what!?! So why ban it? You won't really know if we're doing it in the first place!"
"What you REALLY do in private, we don't really want to know. Our aircrew will not intrude into your privacy."
"So is it can or cannot? Your rules say cannot and then you don't really want to enforce?"
"It is better to accept the untidiness and ambiguity. We shall see how this matter evolve eventually."
"Ok lar...anything you say lar. Anyway, I'm booking a ticket for myself and my partner. You have my details here in my passport. My partner's name is John Smith..."
"... ... ... ..."
(All names and conversational exchanges are purely fictional)