Good sex matters. A sexual fantasy is any mental image, thought, or story that turns you on. You may be dying to act it out or just like to think about it. Ed, sex educator and black queer femme activist. As long as the fantasy is consensual—freely given, reversible, informed, enthusiastic, and specific—it can be carried out. Your fantasy life is your fantasy life, until and unless you choose to make it into more. Sexual fantasies and acting them out are healthy as long as they're approached with respect, and involve consent, consent, consent, and, of course, consent.