Think armpits can’t be sexy? Two words: “Dirty Dancing.”
You know that scene where Johnny runs the back of his hand down Baby’s arm, grazing her armpit?
She giggles at first, but once she gets past the tickle response, it’s totally hot.
A light touch is all you need to turn the tickle to totally titillating. Run your fingertips, your tongue, or even a feather slowly along the inner arm to the armpit.