The following is an absolutely true account of the first time I took a rectal temperature on a girl. By way of introduction I was 19 at the time, she was 18, and she was my girlfriend of some months. We had engaged in anal sex, but it had just never occurred to me to take her temperature this way. For the sake of anonymity, let's call her Vanessa.

It was a quiet Saturday evening, and Vanessa and I lay sprawled on the couch in my parent's home watching TV. My parents were out of town for several days, so we had the run of the house. We'd both had quite a lot to drink the day before and were sort of spent, so we made plans to just stay in that night.

Vanessa kept tossing and turning on the couch. Eventually I asked her if she was feeling ok. She looked at me, and said that she felt like she had a touch of something. Innocently, she asked if I had a thermometer anywhere cause she wanted to check her temperature. I said sure and went to my parent's bathroom where I knew thermometers were kept in a medicine cabinet. As I was rummaging around, I saw one thermometer that I knew to be rectal. I knew this because it was never used for oral temperatures, and in fact hadn't been used since I was a baby. (I have no recollection of my parents ever taking my temperature rectally at all.) The idea dawned on me to have some fun with Vanessa, so I grabbed the rectal thermometer, found some Vaseline, and walked back out to the living room.

Vanessa was watching some mindless TV and looked up at me as I entered the room. I held up the thermometer case and she thanked me for finding a thermometer. She reached up for it, and I pulled away, with a somewhat wicked grin I told her that this wasn't going in her mouth.

It took Vanessa a second to grasp what I meant, but then it dawned on her what I meant. She looked at me, and said "You mean you want to take it in my butt?" I laughed and told her that it was the most accurate way anyways. She sort of blushed and said that doing it would make her feel like a little girl all over again.

I pulled the thermometer out of its case, and began to shake it down. Vanessa watched all this intently, without making any movements. When it was down to around 96, I looked at her and told her to get ready. She sort of giggled nervously and stood up and pulled her jeans and panties down in one smooth stroke. She pulled them all the way down and then stepped out of them, giving her panties a kick across the room with her right foot.

I told her to lie on her stomach on the couch. She lay face down on the couch, and sort of muttered into the pillow that she couldn't believe what she was doing. I took a little throw pillow and had her arch her hips so that I could put it under her pelvis to raise her butt a little more into the air.

At this point I was confronted with a wonderful view of her rear end. She was thin enough so that the cheeks sort of spread on their own, and I could see her lips just peeking from between her slightly spread legs. I gave the thermometer a few more shakes, and then dipped it into the jar of Vaseline, getting it well coated with the slimy substance.

I reached down to Vanessa's rear and pulled her cheeks open just a bit more. She tensed up a little, and I just asked her to relax. I held her open and quickly inserted the thermometer about 2 inches into her rectum. When I inserted, she made a noise as she quickly inhaled air.

I left my hand resting on her cheeks, holding the thermometer in place. After about a minute she said "You sure lubed that puppy up didn't you?" I just laughed and continued holding it in place.

After about 5 minutes, I gently removed the thermometer. She turned on her side and watched me read it. She asked what her temperature was, and I told her that it was 99.2, basically a normal rectal temperature. I gave her a tissue to wipe away the excess Vaseline with.

She stood up and stretched, looking at me. She laughed again and told me that she felt tired, and thought a nap would do her good. Still bottomless, she left the room, giving me a great view of her wonderfully long legs and well shaped rear. I looked at the thermometer that I was still holding, and thought of what had just happened. The eroticism of the moment began to build in me in a way that I didn't even think of while it was happening. The memories of the moment and the sights I had just seen flooded my head, causing a burst of erotic energy. Quickly, I set the thermometer on the coffee table, and followed her down the hall. Needless to say, it was a while before she got to sleep…..