Body language is something that is useful in terms of passing message to someone else without you 

actially talking,some body languages can be used to determine a romantic gesture or to know when 

someone really truly loves you or have a crush on you,for example the way a lady is staring at you 

can be used to know if she likes you,or have a 
crush on you or hates you,you need to have the 

ability to be able to pay great attention to this body languages to be able to understand the 

information that she is passing to you,the best way to read body language is to pay full attention 

to details,you should be very focused on the person who is using the body language