Before you met your date, your little black book was firmly by your side night and day. However, since meeting Mrs. or Mr. Right your LBB is missing. It may be in a dusty drawer (along with your copy of Single and Ready to Mingle) or buried in that no-man's land beneath your bed. Wherever your LBB might be doesn't really matter, the fact is when a cute girl or a hot guy asks for your number these days you're just not interested. This is a true sign you're ready to sleep together.