Nowadays tatoos are no longer for prostitutes (quite the contrary) , it's a fairly widespread misconception.
It was true centuries ago when prostitutes were marked (or branded) with an infamous identification sign, but it was a judicial measure, against their will of course.
In today's BDSM community tatoos are very (too) common and I noticed most models (I would say over 50%) are wearing tatoos.
For me tatoos are a "turn off" (especially the large ones) and I try not to look at them, but it doesn't allways work. However, a small basic unsophisticated tatoo with the slave ID# or name is acceptable to me in this context.
Another thing I strongly dislike are facial piercings w. rings (eyebrows, nose, mouth lips, tongue,...), it bothers me even more than tatoos.
But to each his own (as they say)...