Sorry to bring this thread back up, but I found something quite interesting today:
Splitting the bill on a date in Japan | 世論 What Japan Thinks
Check it out. I think it's important to consider who participated in the survey. It says it at the top, but just for a brief rundown (rounded off for convenience):
Male: 70%
Female: 30%
20's: 26%
30's: 43%
40's: 31%
I think it's interesting to note that the majority of these people are up there in age dating wise (no offense to anyone on here). Also take into account the source of the data. I think that what it shows is is that most men tend to pay MORE than half when they go out. Judging from my own experiences, I think that's quite realistic. Although I'm inclined to believe that younger people tend to split more evenly and more often than older people.