Well, they should never EXPLICITLY ask for money. They shouldn't explicitly ask for presents in general, they should accept what is given without asking. I think that is the breach of etiquette.
But yes, Asian cultures prefer to accept money rather than actual gifts. Things such as registries aren't always applicable, nor do we have bridal showers where the bride gets even more gifts. Typically the maid of honor follows the bride and groom around as they greet each table at the reception where envelopes full of money are passed. The maid of honor carries a bag to which to deposit all of the envelopes as they go along.
At least every wedding I've been to does that, it is more Chinese than ASIAN, I would say.
I'm not sure if they explicitly ask for money or not but I wouldn't be surprised if they did. Lol. It doesn't seem like a big deal to me. I mean, they're preparing for a new life so it's understandable. I don't see it any different as asking for a toaster or a blender but I guess that's just me.
I mean, if it was for a birthday i'd certainly be like "wtf? they're asking for money?!" but yeah. I didn't even know you give gifts at engagement events. Thought it was only the day of the wedding ceremony.
Some say i'm a genius, others say i'm crazy
but they all say i'm a little on the weird side