A good friend of mine gave me this advice and it could well have already been given here, but I'm posting it anyway as it seems useful.

If you have a one night stand with some random woman from a bar or something, take her out to Breakfast the next day. Yes, I know that's going to be awkward, and I know that you want to be 'alpha' by not spending your money, but this helps reduce the chances of you being falsely accused of anything illegal because what kind of rape or sexual assault victim goes out for food with their attacker the day after? I know you may think that the chances of a problem are very low, but if you are bringing some girl home from a bar and she has been drinking, you don't know what her hamster will tell her in the morning.

TL:DR: Take her out for breakfast because then it makes it much less likely a rape charge would win in court