Not necessarily and I think you do need the parametres for your hyperthetical question; I have left a man screaming in agony as he put his hand on my bottom as I walked past and I removed it by bending and twisting his thumb at an unnatural angle without breaking my stride, I was probably somewhere in the age range of 18 -22; if a fella had done it to me when I was in the 14 - 16 age range, I wouldn't have had the confidence. At any age, if a fella was able to get me in a situation where he could put his hand up my skirt easily, I might make a noise but I'd also probably be scared and intimidated. So there's a lot of answers to your question really depending on the situation.