Soumise,
I cannot speak for others, this is the first time I have viewed this, and do not have any discomfort in replying. 😃
That being said, it is not an uncommon thing for people to enjoy the feelings and emotions associated with excitation or stimulation,the rush of adrenaline can be very appealing and/or addicting. It can be from a variety of sources, sexual or non sexual, connected with the use of medical instruments and scenarios or not, or things completely outside the definitions of our community here. For me, it is important that I find,set and do not go beyond the boundaries of what is and is not harmful to me, both physically and psychologically. After I have done that, then what is left for me to do is decide if I want it to continue.
If I do, I then establish a moderation level that will not go beyond my own emotional saturation level & helping to enhance continued enjoyment over a long period of time or the cycle it will follow if for a shorter period, you will know, for me, moderation is a significant key or tool that is very useful.
You are wise to be cautious and careful in wanting to avoid doing anything that would be foolish or potentially harmful to you, those are your natural instincts speaking to you, heed them. Once You have decided what your boundaries are, then you are set to go about your particular enjoyment as you please. Safely included within those boundaries is the healthy decision of being selective about who you may or may not associate with in face to face scenarios, this is good. Below, I will make an effort to give a brief nuts-n-bolts description of what arouses me and why, please note that the majority of it is generally covered in my profile statement with the exception of the last sentence.
The objects that arouse:
Things gently inserted rectally include enemas and/or well lubricated nozzles, butt plugs, inflatable nozzles or plugs, sigmoidoscopes,anoscopes, proctoscopes,dilators, a rectal or vaginal speculum,thermometers,gloved fingers. Things gently inserted into the urethra of my penis include sterile or as near sterile as possible well lubricated assorted sounds, catheters, thermometers,cytoscopes,small dilators & urethral specific e-stim devices. Anything that generates or is associated with pain I do not have anything to do with.
The Reason for the arousal:
All of my life,the use of any of these things have caused profoundly very intense physical arousal for me. It did not matter if it was in the course of routine medical procedure or done privately solo or partnered. The arousal and focusing on the source of that arousal,both physical and psychological was and is undeniable. To this day, there are times just the sight of or discussion of these things is all it takes to get my mind racing along in that direction. Over the years I have learned how to moderate my thoughts and actions in order to prevent the potentially awkward situations you clearly mentioned above, also being selective about who I do and do not discuss these things with.
I hope that you have found something useful to you in answering your question(s) in what I have said, if not,set it aside or feel free to ask for further clarification. Remember, you are not alone and that your "fear" is a type of arousal,set your boundaries,take your time,get to know people. 😃
Sincerely,
G.N.