Until I encountered aliens I was an unattached gay man of 25, and quite happy with the way things were. Last summer I was camping in one of the major North American National Parks. One afternoon I was sitting by a lake, enjoying the sunshine and checking out my neighbor who was sitting outside his camper a hundred yards away. He was a well built black man and, like me, was just wearing shorts. I was just thinking about going over and introducing myself when I heard a high-pitched humming sound. To my astonishment what appeared to be a genuine flying saucer was heading across the lake in my direction. Before I could move I started to feel dizzy and then blacked out.

When I came to I was completely disoriented and could not make sense of my surroundings. Gradually my mind cleared and I was able to take stock of my situation I remembered the UFO and this helped me to figure out what was going on. I was lying on my back, stark naked, and literally could not move a muscle. This was not quite true - I found that I could move my eyes, my head was raised and I found that I could move it from side to side but that was it.

When I looked to my left I wished I hadn't. My cock was lying on a table, three feet from my body! The base was connected to a bunch of wires and tubes that disappeared into my groiin, through a patch where my penis should be. Next to my cock in a dish were two objects that I assumed were my balls, since they were likewise connected - into my empty scrotum. A third object about the size of one of my testicles puzzled me for a minute, until I decided that it was probably my prostate. It also was connected with wires and stuff leading into my groin - I couldn't see where exactly.

On the other side of the table was a large dog, also on its back, with its legs sticking up and secured. It was a male Great Dane and it seemed to be still unconscious. Its mouth was open and its tongue was hanging out on one side. Some of its organs had also been removed and wired up, but not its penis. There were wires disappearing into its sheath Some of the fur had been shaved from its head and there was a patch with wires leading somewhere out of my line of sight. Turning my head to the right, I saw my black neighbor, laid out in the same way that I was. I immediately noticed that his cock was a good two inches longer than mine. He had a patch on his bald head with wires leading behind somewhere, so I assumed that I was also hooked up the same way. He was also awake and when he saw me looking at him he rolled his eyes in a sort of 'what the hell' gesture.

I now turned my attemtion to my surroundings. We were in a large circular room that put me in mind of the bridge of the starship 'Enterprise' more than anything. There were similar work stations around the room, some of them with unidentified beings lying on the couches. There were also aliens in attendance, and I was surprised to see that they looked remarkably similar to some of the illustrations I had seen - bipedal, thin bodies, large heads, huge eyes.

One of the aliens walked over to me, and addressed me in quite good English with a sibilant tone. "I see you are awake" he said, "so I will explain why we have brought you here. We mean you no harm, but we are fascinated by the reproductive mechanisms of the mammals on this planet. I am a biologist. We have temporarily removed some organs from your body so that we may more easily determine their function. We are able to completely supress loss of blood and the feeling of pain while we perform some experiments. By means of miniscule robot mechanisms we are able to connect artificial nerves and blood vessels to the organs while they are not attached to your body. Let me demonstrate." He picked up my penis in one hand and aqueezed it gently. I foud that I could feel every movement as if the organ was in its proper place on my body. With his other hand he stretched out a long finger and poked one of my balls. He poked it quite hard and I really felt it. It was a wierd semsation to feel it rolling around the dish it was in.

"What I am going to do now is to check your reaction to visual stimulation. "As the alien said this a screen appeared in mid air in front of me. It started showing a typical porn video with big-busted women cavorting with big-dicked men. Scenes that didn't turn me on at all. I looked over at my black neighbor and saw that he was watching the same video. I was disappointed to see that his penis was rapidly gaining length and rigidity. Oh, well; the odds had been against his being gay like me.

'My' alien had of course noted my lack of response to the video and he shut it off, saylng, "You're one of the other kind are you?" A new video appeared on the screen; this one featuring 2 men - one black, one white. I found that what they were doing to each other was quite entertaining and my disembodied cock reacted appropriately. The alien nodded his approval at this response and picked up my penis while shutting off the video. "Now I'm going to check your reaction to tactile stimulation." So saying, he started stroking my cock with one hand while gently squeezing it with the other. Normally this would have caused a muscular reaction making my cock jerk up and down. Now, however, although I could feel some movement in my groin, my throbbing penis only twitched slightly. "That seems to be satisfactory; now we'll see how your prostate likes to be stimulated." He pushed the head of my penis into a glass jar and set it on the table. He then picked up an instrument with two terminals, touched them against my prostate and pressed a button. I felt the resulting electrical pulse in my balls! They reacted by sending a load of semen toward my quivering cock. Normally this would cause an almost instant ejaculation, but that couldn't happen now. I was able to watch my cum flowing through transparent tubes until it disappeared into my groin. Almost immediatelly it reappeared in the tubing leading to my cock. This long journey seemed to have tired it out, so that after passing through my pulsating cock it just dribbled weakly into the glass jar. The alien was prepared for this and disconnected the wires and tubes from my testicles. He attached something that looked like a bicycle tire pump and used it to push the remaining semen through the tubes and my now deflating cock until it had all flowed into the glass jar..

"That's all we need from you," said the smiling alien. I'll leave you now, and a technician will shortly come along to put everything back where it belongs.. He left, and I turned my attention to what was happening on my left. A process similar to the one I had endured was being performed on the Great Dane. It was evidently being tested for reaction to odour instead of vision, as it had a mask over its muzzle. As I watched, its red penis started to protrude from its sheath. After that the procedure was much the same as it hd been for me - including the final pumping. The alien had set the dish containing the dog's balls next to mine, and I saw him comparing the two. There was actually very little difference in size. What happened next changed my life.

The alien stared at me and then, to my horror, switched the two dishes, pushing the one with the dog's balls close to me. He then left. Almost immediately after that the technician arrived to put me back together. Ignoring my head shaking and eye rolling as I tried to get him to understand what had happened, he injected something into my arm and said, "you will sleep now, and when you wake up you will be back where we found you and probably won't remember anything that has happened to you."

He wasn't quite right. Although I didn't remember anything when I woke up, thinking I had just had a short nap, it wasn't too long before I began to notice some puzzling behaviour. I had never been particularly interested in dogs, but now I found myself attracted to them, particularly large male dogs. To my horror I found that I wanted to sniff at their genitals, and even worse I daydreamed about giving a dog a blow job. Finally I started having dreams about being abducted by aliens and eventually the whole episode came back to me, including the testicle exchange. By this time my balls were starting to feel, not painful, just uncomfortable. I decided to consult an urologist.

When I was admitted to his office and pleasantries had been exchanged , Dr. Masters asked me what seemed to be the problem. I told him that he would not believe what I had to tell him, and asked that he perform a complete examination of my testicles - X-rays, UltraSound, plus anything else he could think of. When he had the results of these tests I would explain what had taken place. He thought this was a most unusual request, but reluctantly agreed, and asked me to return in a week's time.

When I walked into Dr. Masters' office the following week the first thing he said to me was "woof, woof." In a way, I was almost relieved to hear him say this, because it meant that I hadn't been dreaming about being abducted by aliens. I asked him for a report on what the tests had shown. He told me that I had a pair of canine testicles in my scrotum and that the manner in which they had been integrated into my system indicated a level of surgical technology far in advance of anything he had previously encountered. He then went on to say that there was a problem. Whoever performed the transplant was evidently not aware that the human body frequently rejected foreign tissues, and that this was taking place right now. There were anti-rejection agents available, but in my case too much time had passed since the transplanting for them to be effective.

When I explained what had happened to me, Dr. Masters was initially quite skeptical, but finally came to the conclusion that there was no way that the operation could have been performed by a human. He also informed me that there were probably two people involved in the little joke I had been subjected to. There was no way that the technician who reunited me with my genitals could have done so without making some modifications. He must have known that it was not my original testicles he was putting back into my body.

Dr. Masters then confirmed what I already suspected. My doggy balls had to come off before any infection set in, and right then would be a good time for it to happen. So it was that an hour later I left Dr. Masters' office as a brand new eunuch, wondering which was worse - having no desire for sex, or lusting after every male dog I saw.