Cancer makes Scorpio feel secure. This relationship has great intimacy, intensity, and depth. Great pair. Cancer is loyal which is good for Scorpio抯 jealous streak. Cancer抯 possessiveness will make Scorpio feel secure. Both are intuitive and sense what will please each other. Together they will feel safe and loved. This pairing has great intimacy, and depth. Long lasting relationship. Both are jealous but the heat in the bedroom will cool the disputes. Cancer is clinging and insecure and Scorpio offers the strength and protectiveness Cancer is looking for. In turn Cancer is loving generous, devoted---all that Scorpio wants. Perfect match. ( Source: Astrology Fun )

Cancer Man & Scorpio Woman

This is tied with Pisces as your number-one soulmate match. First of all, the physical chemistry between you could power enough light bulbs to brighten an entire city. Your kissing sessions will be amazing! The chemistry will also last and get even better the longer you are together. The Cancer boy also has staying power emotionally. He will stick by you and devote himself to making you feel special. This will satisfy your need for security and you will find yourself relaxing with him and really enjoying being taken care of. It's a match that will make both of you feel really treasured. A perfect soulmate match! ( Source: Jellybean's Astro-Soulmate Guide )

Electric attraction and deep emotions are what initially draw Scorpio girl to Cancer boy. Mood is the order of the day when these two signs team up, and there will be no dearth of emotion. You can inspire each other to wonderful heights, as long as you don't allow negativity or possessiveness to enter the picture. ( Source: FUNgirl - Astrology )

Cancer can be possessed completely by Scorpio in sexual relations, and be inspired to greater response than he/she can with any other sign.  Cancer is able to express her/himself more with Scorpio, thus widening Cancers horizons of passion.  You have to say this is a match made in Heaven.