Treat your date with the respect and purity you hope your future spouse will have. Keep in mind how you will expect a young man to treat your daughter one day. By listening to your conscience in this way, you'll have a good idea of where to draw the line.
At that time in my career, everything ended up moving so fast, honestly. Within the first five years of my career, I think I did two TV series and four big movies, and I've never been that hot again in my career.