Definitely Spain - very nice place and helpful people and a wonderful selection of hot girls starting from 70-100 eur for hour with a wide range of services. If you can express basic ideas in Spanish that would be better. Even11 is quite nice
https://www.evenonce.es and with spalumi.com you can read a lot of reviews.
I would love to try Portugal sometimes, as well as Greece for the sea.
Germany, UK, and Netherlands are of course the other obvious choices. The Amsterdam RLD at 2am is way safer than my own hometown centre at midday...