Cancer
They are the passionate of all signs. Like their sign 'Crab', a wrong move can turn them off as quickly as you turned them on.
For Cancerians, Sex is emotional and they look for soul lovers. Cuddle, Kiss and touching is what they love the most.
Once in action they can give you a mind blowing experience; but they are not the cuddlers after-sex. They prefer to have a quite nice sleep after sex.
So next time if your partner (man/woman) dozes off, then just don't jump into conclusions. For them it's normal to sleep after sex.