Very complicated question. My suspicion is that it's almost certainly down to better reporting and a higher likelihood of bringing such incidents to the attention of police, rather than an actual increase in the occurrence of such offences.
It is a huge social, political and legal change over the last few years.
Men, women and children are listened to when they report sexual abuse. The cases are investigated properly and the victims treated with respect.
This simply was not the case even 20 years ago. I would stick my neck out and say there is not a higher rate of sexual offending today but there is a much higher rate of reporting and we all know many of the cases currently being reported and going through courts now are historic, some going back 50 years or more.
I would suggest that Alcohol has a lot to do with it, young men & young women under the influence have very little control. What happens when you are in an alcoholic daze bears little resemblance the next morning in the light of day.
Changes in legislation (and the way that the CPS decide to charge people) might also have something to do with it, as the definition of 'rape' is now far broader than it used to be. For example, the perpetrators of the famous 'Carry On' scene with the daffodil could now be charged with rape because anal penetration with any object is included within the current definition.
You my dear ummmm are very much in control, have you not seen disgusting news reports & pics of young men & girls ( especially girls) off their trolley outside drinking establishments ?
A friend of mine was raped, and she reported it. He was caught, tried and sent down for 7 years. However, she said that if the same thing happened again, she would not report it because what she was put through at the trial was worse than the original ( very violent ) rape.
Rape is not always about random strangers. These days apparently a lot of it is about young men taking advantage of vulnerable girls who have imbibed too much drink.