Temperature taking fetish is a sexual fetish for oral thermometers and rectal thermometers. This may include the sexual attraction to the equipment, processes, environments or scenarios/situations. Sexual arousal from the desire to take another’s temperature or have one’s temperature taken is primarily what surrounds the fetish.
Even though the thermometer is of a small diameter, there is a pleasant feeling associated with it being inserted. The physical sensation is enhanced by the scenario, but there are a lot of nerve endings around the anus and they are hyper-sensitive during this time. Even if the thermometer is inserted quickly and steadily, as would be the case in a medical setting, there is a brief moment of stimulation. It is actually because of the small size of the thermometer that it feels good – like a light touch across an erogenous zone or a playful tickle. Beyond the anus, there is the involuntary flinch or contraction of the anus when it is first touched that also causes a deeper feeling due to the contraction of the pubococcygeus muscle and, in the male, also somewhat stimulates the prostate. With the thermometer inserted, the anus closed around it, there is a constant light stimulation; if the thermometer is moved or the anus is clenched or relaxed, there is additional stimulation.
The feeling of the rectal thermometer [being] inserted is a separate and different sensation from the insertion of a finger, a medical instrument (like an enema nozzle or a scope) or a sex toy. These, while stimulating the anus, also cause arousal due to their size and depth.
While rectal temperature taking is more prominent, there is also an interest in oral temperature taking. With respect to rectal temperature taking, the scenario for the purist usually involves the use of the traditional mercury-filled with stubby bulb, yellow-banded, red-tipped thermometer. Seeing it lying on the table, ready to be used, next to a jar of Vaseline of a tube of K-Y jelly . . . is the beginning of the arousal.
A separate or additional scenario of having the underwear lowered, the buttocks separated to inspect the anus, the lubrication of the anus (with a finger in sex play but traditionally just slightly with the lubricated tip of the thermometer prior to insertion in medical use), and the insertion of the thermometer (again, slowly in sex play, teasing the anus before slowly inserting it into the rectum). Taking the actual temperature and recording the reading is also a critical aspect – while the thermometer is inserted, the buttocks and upper thighs may be massaged, at a minimum, and the thermometer is “adjusted” by rotating it between the fingers and/or moving it in and out. A slow removal of the thermometer intensifies the removal process after four minutes. After the temperature has been noted, and the thermometer cleaned and put back in its case (or, in some cases having to be used again to verify a questionable reading) having the buttocks spread and being wiped of the lubricant is the concluding act of stimulation and submission in the scenario. Lying on the bed, exposed – with a thermometer inserted – is also erotic in a submissive and/or exhibitionist way.