Most Helpful Guy
When asking sometines money will be discussed and someone will say if they can or can't. So then it's up to the person making the plans.
Otherwise if the girl is making plans both should split the bill.
Guys should be giving a clue as to who is going to pay, some good guys will either automatically assume the role to pay or he will declare it to be split.
Most Helpful Girl
If a guy asks a girl out on a first date, he should pay.
If a girl asks a guy out on a first date, she should pay.
Any date after that, it is polite for the person who asked the other person out on the date to pay for it. Or you both talk about it and agree to take turns paying.
Always assume you will pay for your part of the date, and have enough money to pay for the other person as well in case they forget money or it's your turn to pay for the date.