What's your nastiest dirtiest sexual fantasy?

Rape fantasy, and some kind of orgy. But I would also like someone to fuck me while I'm tied to a tree, or some kind of violence. Having sex while you're on acid.

Most of this list isn't dirty--it's just icky

I voted too quickly -- for mutual masturbation -- I think my nastiest fantasy would be mild BDSM, that is, me tied at the wrists and ankles so I'm helpless on my back on a bed, and someone, male or female, able to stimulate me by hand or mouth at their whim, bringing me close to orgasm and then backing off, making me desperate for release but being forced to wait for the other person to decide when I would get off. There could be a room full of people watching, too, perhaps tied down to someone's dining room table or to a table in a restaurant or helplessly spread-eagled in a university lecture hall full of observers, as I moaned and whimpered and pleaded to be untied or brought to orgasm and relief.

Love animals so it wouldn't be bestiality but (rather) zoophilia

Mine is to be raped by a guy or 2 and involves woodlice (pill bugs)which are put/left inside me.Just a fantasy i know but still excites me

Mira Sorvino, a waterbed, and a bag full of hedgehogs.

Mmm well it involves my 17 yr old half cousin, a stunning girl from college, and a milf in my block( she is her mid 40s looks like she is 20) So i am doing some yard work at the milfs house, i am shirtless. Some frees-be hits me, then girl from college walks and its surprised to se see me. She says she would do anything so i didn't tell she invaded the milf's property. 'Kiss my chest" she is not stuttered and does it, she pushes me against the fence, and presses her right thigh on my crotch. My cock starts to get hard as she licks my nipple and playfully sinks her nails in my lower back. Then my underaged cousin calls her, i recognize her voice, "tell her to come" she walks near us and is sort of shocked to see what is going on. "come, someone wants to say hi" she walks close, i insert my middle finger in the college goddess's anus and massage her heavenly ass. My half cousin is getting wet and sees the bulge in my shorts. College girl pulls down my sorts and both girls are amazed at the sight, then she resumes by making out, she grabs my cousins hand guides it to my erect penis, she starts to stroke it and the feeling is fucking ecstasy. I keep massaging both their asses. Cousin takes her bra off i pick her up and suck on those beauties, college girl is on her knees giving the best head. I can feel her soaked pussy in my abdomen. i stick my finger in her slowly and get more excited by her moans. Then I hear" HOLY SHIT, ... What the fuck is this..." college girl walks over and kisses the milf in the mouth. Both start to make out passionately as the milf gets undressed and i begin to tease my half cousins beautiful pussy. God she is so tight, milf walks over and begins to kiss back and neck and it massage her huge breast. As i fuck my half cousin hard they are fingering each other. Then i fuck my goddess like i am a fucking demon i make her my little whore. I am exhausted so the milf takes over and tells them" you girls have fun while you watch me make him cum" she begins to suck my balls and rub my dick with great technique. My head begins to hurt a bit due to the extreme blood pump. She then rides me so hard i feel like cumming but i can't " no sir, you will cum when i want to" im getting extremly built up, " ok girls, come, lets take his load" the each put their lips and mouths and just tease my cock so good, the milf gives me a great ball massage, i am just twisting and swearing wildly as i can't take it anymore, then i cum in relief. Each of the 23 shots come out warm and the feeling in the tip of my dick as the cum slides out of my cock is indescribable. my whole body gets really warm, my toes curl every single muscle contracts at once. i feel like i just got a great massage and like i weighted nothing, the loads keep coming as they each take turn sucking every last drop. they all swallow and we all lay in there naked....

I had no idea what Coprophilia was, but that is just nasty!

I have a pretty intense fantasy about a certain Super Hero..not the actor from the movies.

violence

I don't think this is on here,
but I sometimes get turned on by the thought
of a preacher/holy figure coming onto me.
Especially when he is in uniform.

Im a guy and would have a three way with my cousin and her best friend who are girls

A teacher/pupil rape fantasy. ;)

four words ice oil table and tounge

I have sort of a rape fantasy! I am not saying that I want to be raped, but I would want my partner to hold me down and act like he's forcing me to have sex...