Nipple stimulation can activate the same brain area as genital stimulation in some people. Brain scans showed that when nipples are stimulated, the genital sensory cortex can light up.
High thigh socks (often called over-the-knee socks) became popular in Japan during the 1990s with the "Zettai Ryōiki" fashion trend - the term describes the little strip of bare skin between the top of the socks and a skirt/shorts.
It is well known that the clitoris is one of the most sensitive points on the female body. It is the most powerful female erogenous zone. It has 8,000 nerve endings, making it an inexhaustible source of pleasure.
Selfies may increase social sensitivity.
One study found that taking and sharing selfies was associated with a higher level of social sensitivity, meaning people become more attuned to social cues (like how others perceive them)