DO NOT make decisions about relationships. If you are backed into a corner and must make a decision, stall. If you still must come up with an answer, leave yourself a loophole for escape. If whatever you're doing does not satisfy you completely in 5 minutes, it's really not worth it. Try to have a good memory, but it's OK if you forget trivial things.
Ignorance solves problems.
If you can't see them, they can't see you. This is the desired reaction. Men are born without virginity. If you ever go shopping with a girl, drive around until a parking spot right near the door opens up. If this takes hours, so be it.