Went to Medellin just for monger and food 6 years ago. Here is my impression of Medellin mongering
1. Hot girls if you are into big boob and ass
2. Girls willing to please
3. You can find semi pro or part time working girl (i.e. college student) on facebook at lower price than going to strip club or massage palor
4. All strip clubs have back room where you can take her for full sex. I had good time at Discoteca Fase II (pricey but all hot girls)
5. You can find weed easily. Most girls smoke weeds and have some for you if that is your thing
6. Many American perv gringo go there or live there for the girls. Most of them are pretty friendly. You can meet them at American bars and they can give you local intel
7. Learn some basic spanish or bring a electronic translator. Most of girls have limited English skill
Lastly, you can get update to date info about the scene here:
http://www.internationalsexguide.nl/forum/showthread.php?583-Medellin-Reports&
Bring lots of Condoms from home