From my (albeit limited) experience:

After a few (several) too many drinks, it's too late for her to get the train home, so she books a room for the night in the hotel where we've all been drinking.

When the rest are off playing pool or something, I ask her if she'd mind my coming back to her room, to talk

After the inevitable 'don't think so,' my next line is:

'Please'

Doesn't sound much, but we've been together ever since!

JJ