Since I live partly here and partly in Germany I can comment on the differing age of consent laws both here and there. Here it's 16, we have one of the highest teenage pregnancy and STD statistics in Europe. In Germany the age of consent is 14 and they don't.
The main difference between German teenagers and UK teenagers seems to be not so much moral as motivational in that in Germany most teenage girls would genuinely consider it a disaster to get pregnant at 14 or 16, where as here it would not be viewed half as seriously. Most German teenagers are not promiscuous nor are they the victims of paedophiles, nor does Germany as a whole have the same hang ups about sex that we do here in the UK in that they have no desire to criminalise their children for having sex with other children. If you want my opinion on age of consent then 14 is ideal, however until teenagers in this country have more expected for them, have a sense of their own worth instilled in them, are required to be more self disciplined and given more responsibility I think we will continue to get the same issues with pregnancy and STDs.
Would I at 15 consider someone, ( anyone) trying to kiss me sexual assault ? No I would not, and I think Ms Hewson is seeking to point out that the bar that constitutes sexual assault is lowered every year and that at some point we do need to call a halt to that or we end up in a hell of no-one being able to interact with anyone else normally. Should sexual assault (that are actually sexual assaults) and rape be pursued regardless of age etc, then yes they certainly should, but she is right in the sense that it does no good to the victims to lump a man who has simply tried to kiss someone in with a child rapist.