Though I am a middle-aged male, I have very vivid memories of having my temperature taken rectally by my mother when I was growing up. Whenever I was sick, or she thought I might look sick, it was into the bedroom where I would have to lie down on the bed, pull down my pants and underpants and await the thermometer. Initially it was very embarrassing, but as I got older, I realized how good the thermometer felt in my ass and how excited my cock got just at the thought of having my temperature taken. My mother would spread my legs apart, dip the thermometer in the Vaseline and then spread my ass apart and slide it in. She usually left it in for about five minutes, which seemed like forever, and then would pull it out, wipe it off, read it, shake it down, re-lube it and stick it back in for another five minutes. She always said that she wanted to be sure the reading was right, but I'm sure she just enjoyed doing it. She would usually keep her hand on my ass, adjusting the thermometer from time to time. If I did have a fever, she would take my temperature every hour or so. When the fever went away, she would still take it for a couple of more days, "just to be sure". This went on until I was fourteen or fifteen years old, and by that time I realized how erotic the procedure was, as well as having thoughts about what it would be like to take a girl's rectal temperature, and if in fact, any girls had it done that way. Of course, at that time, it just remained a fantasy.

My mother also saw to it that when she took me to the doctor's office, the nurses also took my temperature that way, which back then, wasn't unusual. She would just tell them that I had a fever when she took my temperature rectally and that they should take it the same way. It didn't take a lot of convincing. The nurse would have me step up on a little stool, drop my pants and underpants and bend over. Then she would tell me to just relax and she would insert the cold thermometer in my ass. Of course, my mother was there watching all the time. It also left me in perfect position for the usual penicillin shot in the ass, the thought of which was probably the only thing preventing me from getting an erection.

However, when I was about eighteen I had to go for a sports physical, and by that time, went to the doctor alone. The doctor had come in first, did a typical exam, and then told me that the nurse would be back to get my temperature and blood pressure. As soon as he left, a very attractive nurse, not much older than myself, came in and took my blood pressure and wrote it on my chart. She hesitated a second and then told me that she saw that I had always had my temperature taken rectally. I told her that was when I was little, but she told me it had only been a few years ago according to the chart and that there was no reason to change now. I really didn't protest too much and in short order I was once again bent over the table. The nurse put on a rubber glove and spread some K-Y jelly on her finger and spread my ass apart with her other hand. I jumped a little when she touched my asshole with the cold jelly and she remarked that I seemed very sensitive there. Then she told me not to be embarrassed and I felt her finger slide into my ass. It felt so good as she worked her finger in and out and around and around. She finally took it out and slowly inserted the thermometer, holding it in with two fingers right up against my asshole. I thought I was going to cum any minute when I heard the nurse say, "there we go" and I felt the thermometer slowly being pulled out between my cheeks.

I was getting ready to pull up my pants when the nurse came over with a paper towel and told me she was gong to clean me up a little. That's when she noticed my full blown erection. She just smiled at me, said that she thought I was enjoying it and that she was going to help me get the swelling down. Without saying a word, she put on another glove, put some K-Y in her palm, and started to stroke my cock. Then she slowly inserted her finger back in my ass and began to massage my prostate. Within seconds I shot an enormous load all over the paper on the exam table and almost collapsed. It was the most intense orgasm I had ever had. The nurse wiped the jelly off my butt and cock for me and then gave me a slap on the ass. "Let's just keep this between us," she said smiling. Unfortunately, soon after, the doctor died and I never went back to that office or saw that nurse again.

However, my dream of taking a girl's rectal temperature never died and when I was in my thirties, I finally got my chance. I was dating a girl named Susan, who was very submissive in nature, loved sex and was eager to please. One night when I came over to see her, she was lying in bed wearing just a T-shirt and panties. She said she didn't feel very good and thought she had a fever. I felt her forehead, which was warm, and I asked if she had taken her temperature. She said no, that she didn't even have a thermometer. I then offered to go to the drug store to buy one and she said ok. When I left, I'm sure both of us expected me to return with an oral thermometer, but when I got to the drug store, the first thing that caught my eye was a rectal thermometer and my dick immediately started to get hard. I hesitated but decided to take a chance and bought the rectal thermometer and a jar of Vaseline. When I came back I walked into the bedroom and Susan was on her back with her eyes closed. "Let's turn over," I announced. "Time to have your temperature taken." Susan's eyes shot open and her face turned deep red when she saw the thermometer standing straight up in the Vaseline jar.

"Oh Jesus. You've got to be kidding!" she said. But I just told her it was time to have her temperature taken like a little girl, and that if she complained too much, she would get a spanking too. Unsure but willing, Susan flipped over and I slowly lowered her panties and took them off. I put one knee between her legs, forcing her legs wide apart, fully exposing her lovely pussy and tight asshole. I rubbed some Vaseline on her asshole and slowly slid my finger in. Susan started to wiggle as I finger fucked her beautiful ass. I then replaced my finger with the thermometer, and as I played with the thermometer, I could see Susan's pussy start to open and get moist. With the thermometer in her ass, Susan told me that her mother had always taken her temperature rectally and that she always wondered what it would be like to have it done again. I took her temperature a lot longer than five minutes and gave her a nice little spanking when I was done. By then Susan's ass was in the air and she was begging to be fucked. Since she was already well lubed, I gently slid my cock in her ass and we both loved it.

The following week I must have caught whatever Susan had and she spent the weekend taking my temperature in my ass, spanking me and fucking me. That scenario became a regular part of our sex play.