Some countries are more open than others, therefore more data are available. The lack of data does not mean that the incidence is lower, it is just that is is more hidden.
There is no data to gather here -- this is easily observable if one lives in Muslim countries.
In Western countries, there is pressure on boys to woo girls and "get laid". There is pressure on girls to look pretty and sexually appealing to guys. This continues well into the age of 20s for either gender. The ones from either gender not meeting these expectations are deemed less worthy for the society.