Sending a belt means that a woman wants to tie a man, and wants to tie an invisible heart with a tangible belt. It also means to tell the other person to tighten his belt, not to fool around. Basically, it is given to the other half of their own or have a good impression of the opposite sex, can not be sent.
Belt is a symbolic gift, generally only intimate people or couples will give belts. You can't give it away.
Because a belt is like a widened rope, giving a belt has the meaning of tying a man's heart. Tie the invisible heart with the visible belt. Generally, couples send belts or give belts to people they like because of this implication of belts.
The belt has another meaning. Because the belt is firmly tied to the waist, there is the meaning of "bondage", so the belt also has the meaning of letting the other party tighten his belt, do not have an affair outside. A belt between a husband and wife will have this meaning.