Sherlock Holmes & Watson walking through park

Dr. Watson and Sherlock Holmes were walking through the park when they
passed three women eating bananas.
"Ah", said Holmes, " I see a spinster, a prostitute and a newlywed."
"Amazing, Holmes!", said Dr Watson, "How did you deduce that?"
"Elementary, my dear Watson. "See how the spinster breaks the banana
into small pieces before possing them into her mouth? Whilst the
prostitute in the middle holds the banana in both hands."
"Yes, Holmes, but how do you know the other one is newlywed?"
"Well", said Holmes," she's holding the banana with one hand and
thumping herself on the back of the head with the other."