Fantasy helps you to get excited. You can get excited by stimulation of your genitals alone, but what happens in your mind is equally important. Some people need fantasy to be able to come to orgasm, either alone or when they are making love.

You can also use fantasy to get ready for a sexual encounter. By rehearsing in your mind what kind of actions you could take when you want to go further than kissing, you may be more relaxed when it actually happens, being prepared.