I was once halfway through a booking when I noticed the letters "IRA" crudely tattooed on the girl's arm. Needless to say I didn't return.
In general I'd rather not to see any tattoos, but given how that seems to have become much rarer recently even among non-WGs I know, it doesn't happen often. I can cope with a couple of small ones, but some of the other examples posted look hideous.