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If she agrees to have sex with me then I can do it however I want.
If she agrees to have sex with you (big if here) then you'll do it however both of you consent to.
When you pay for them on dates it does.
Then if you're with a girl that you're just having sex with, don't go out for dinner with her or make her pay for own. If she doesn't like it, then I guess you don't need anything beyond that. I've never heard of people who have casual sex going out for dinner as well.