I think we all have a moment in our life that we have a desire for someone or something, maybe some people have more than one or multiple at the same time. It would really depend on the person having the desire what type of desire it would be and if he or she would have more than one. I don´t think having a desire for someone or something is a bad thing, as long as you play by the rules. Because nobody wants unwanted attention, just remember that you know when to back off and move on. It sucks if someone doesn´t share your feelings, but that´s part of life and you´ll just have to move on. I guess romantic movies will give you some type of hope that opposites attract and in some cases that might be so. But as much as you might want it to, your life is not a movie and there isn´t always a happy ending. This might be cold and harsh, but that´s how it is and whining about it won´t change anything!
A lot of people will probably have a fantasy of some sort, maybe an attractive woman in latex or a man dipped in chocolate. There is nothing wrong for wanting that, but never force such a fantasy on someone. I´ve had a girlfriend that didn´t like latex or leather, I never forced her to wear anything she didn´t want to. Being in a relationship means you give and you take, but it doesn´t mean you force and you take. It´s of course nice if your partner shares your fantasy or has no objections to make that fantasy come true. Unfortunately this doesn´t count for everyone and it sucks if the person you love has no interest in your fantasies. I guess you can talk about it and maybe make a deal, she does something for you and you do something for her. But it´s tricky, sometimes your fantasy can scare someone away and that fear can keep you from telling something you really want. I think when you´re in a relationship and you really love someone and the other really loves you then you should be able to talk about anything. But just to be safe, certain things are probably better left out. If you want to be a human toilet then I don´t think your partner would like that, so it´s not a stupid idea to think before you say something. I´m not a big fan of keeping secrets when I´m in a relationship, but I think when it comes to something extreme you might feel more tempted to keep certain things a secret unless you´re absolutely certain that he or she wouldn´t mind.
But getting back to when someone doesn´t see you as you see them, an unanswered love. I would recommend not giving up too soon, if you really love someone and the other shows a little bit of interest then you can do your best to win them over. Write poems, sing a song (if you´re a good singer, nobody wants to hear how a cat gets strangled!), organize something special for that person or just be yourself and spend some good quality time together. It sucks when you´re in the friend zone, when they can´t see you as more than just a friend. Maybe it´s even worse when you´re a very good friend but still nothing more. That´s frustrating but it happens and there is nothing you can do about it. Because being persistent and bothering that person with your affections might not help you advance with your plans. Perhaps being that good friend might actually help you get closer, don´t be too disappointed if that´s what you are to them. Show that person who you are and what you can be for him or her!
So desires, what to do with them? Well you could other people about them and maybe find someone with a similar interest. Of course you probably should be careful where you would put such information. But probably most of the time you´re here on Earth you´ll be keeping desires to yourself, because it´s not easy to confess them to others and even when you do then it´s not always easy finding someone that would be interested in that. But never say never, we´re not that unique that we don´t share similiar interests. About twenty years ago I thought I was the only one that got turned on by latex, well that turned out to be more popular then I first thought. Life is full of suprises, so never be afraid to tell someone what´s on your mind. But I would suggest to think before you speak, you don´t want to spill your deepest and darkest desires to someone who has absolutely no interest in them!