Many spankos on this blog- and others, seem keenly interested in rectal temperature taking as perhaps a pre-amble to an over the knee bottom warming, or as a moment of respite in between spankings.
So what makes rectal temperature taking appealing? Could it be that the site of a rectal thermometer in the medicine cabinet (with a jar of Vaseline), invokes the same personal (childhood) embarrassment as the site of a hairbrush or a ping pong paddle on the dresser?
In my personal experience, most spankers/spankees enjoy a level of anal play. Rectal thermometers are perfect for the novice bottom who may be receptive to moderate anal play, but are a bit apprehensive with bigger objects which may present discomfort if not inserted properly -- or too eagerly :-) My personal preference is for the old mercury based glass thermometers* (although they should be handled with great care because they're glass and breakable), as they are typically thin, and long enough to remain tucked in a well spanked bottom without a need to hold it in place.
As with spanking, caution should be used when taking a temperature-- and careful detail can provide a safe, and highly effective way of enhancing a spanking experience. Like all anal toys, NEVER insert a thermometer so deeply so as to cause discomfort. Always make sure you have your spankee positioned firmly over your lap to prevent any abrupt movements which can have un-intended consequences. As with ANY anal play, lubrication is a must.
To open the spanked cheeks with thumb and forefinger and to 'gently' insert a thermometer an inch or two will promote a (non-intimdating) feeling of being both exposed and invaded- a feeling I have found seems universally enjoyed by most who enjoy being over a spanker's lap. Slowly (gently) rotating the well lubricated thermometer with your thumb and middle finger will often produce a knowing- over the shoulder, grin from your red rump lass, that you're playing the right notes.
Taking rectal temperatures safely can add an interesting (and more intimate) angle to the spanking experience and can open doors (pardon the pun) to other fun (safe) anal activities. Truth be told, many women are highly anally erotic, however many more may be apprehensive due to an unpleasant experience with an unpracticed or over eager lover who may have been more interested in his own pleasure than hers.
Proceed with caution-- always play with clean equipment and remember, if you're really interested in getting her to let you in her backdoor, there are a lot of nerve endings in the anal region, so often very delicate contact can elicit a favorable response.
*Glass mercury based thermometers were commonly used in past, however many of these thermometers (while accurate) have been discontinued due to the possibility of breakage and the potential for mercury poisoning. They are no longer available in most local pharmacies, but digital thermometers and others can be purchased and enjoyed as such without fear of accidental breakage. For the connoisseur, you can still find some of the old glass mercury thermometers (red tipped) on E-bay.