A person faces a 66% of being raped in the UK by a British citizen, but only a 33% chance of being raped by a foreignor. Does that translate into larger sections of either populace being rapists, nope. It just translates as a frequency, it could be larger larger number of rapist or just very active smaller numbers of either group.
The chances of being raped in the UK are smaller than those in the USA, but not by much.http://www.nationmaster.com/graph/cri_r ... per-capita
If you compare the stats with http://www.nationmaster.com/graph/imm_n ... per-capita
first you will notice Sweeden and Belgium don't have rape statistics on the other chart, and South Africa isn't on the immigration chart. But you will also notice Switzerland which ranks 4th in immigration is 34th in rapes. And conversely Canada which is ranks 1st in immigration is 5th in rapes. Many rank about even like the US Canada UK Australia, many others don't Switzerland Denmark Hungary Italy. The correlation with immigration is spurious.
What is known is 4/5 of rapes in the USA are by someone who is known, much like murder statistics. 14% of rape victims in the USA are raped by the husbands. On 16% of Rapes in the USA are reported to police. http://www.hopeforhealing.org/myths.html
In the UK the most common rapists are husbands and partners. 97% of rapist are known by the victim. 1 in 4 women experience attempted rape. http://www.truthaboutrape.co.uk/index2.html
The focus should not be on cultural groups, it should be on changing cultural influences which make rape seem less criminal than it is. For instance the idea that getting a girl drunk is how one gets in bed with her, or if she is dressed a certain way she deserves to be raped. Rape is crime and we as human beings need to learn to stop it like all violence.