Possible reasons:
1. Don't want to see their own nationality to avoid risk of meeting someone they know
2. On the whole,different cultures/nationalities have varying degrees of treatment,and views,of women,
especially ones who work in the sex industry,and they want to safeguard themselves against possible
mistreatment as much as possible
3. They only want to meet Irish guys as we are world-renowned as great lovers and monetarily generous