My adult kids are pretty responsible, they've never really had a curfew, but they've always asked if they can go... and let me know what time to expect them. My daughter is terrible about the on the way home thing sometimes. She'll call and say I'm on my way home, do you need anything? No. I know how long it takes for her to get home from where she is, but to her on my way home could mean "done shopping, going to stop to eat, drop friends off etc." and she'll be home an hour and a half later than she should, but we're working on it.