You must be direct, Cancer will not. Let your feelings for them be known, this is the first step to initiating a relationship with a Cancer. This way, will not have to risk rejection, one of their biggest fears. If you are looking for a short fling, be straight with them. Do not lead them on to thinking there is long term commitment is there is none because you will hurt these emotionally delicate people. Trust is the most important. Build trust with them and they will gradually get closer to you. Give them approval and compliments but be careful because they will easily sense when you are complimenting them just for the sake of it. Be sincere. Ask Cancer for advice, share your problems (but don't burden them), they enjoy helping people and giving advice. They like culture and lavish experiences. Take them to a play or museum and a fancy, upscale restaurant. Do not force Cancer into a relationship or make them make a decision on the spot. They will shy away from you. Have patience, this is the key to attracting a Cancer. Be physical with them, they love genuine affection. They are very cautious and as time passes, they will slowly grow closer to you and you will have wonderful, fulfilling relationship.