Nipples don’t have muscle inside them — the erection of the nipple happens because of tiny smooth muscle fibers in the areola that contract in response to cold, touch, or sexual arousal. nudes
Peak sexual encounters tend to cluster around night
A classic human behavior study found that, across adults, most sexual encounters occur around bedtime (roughly 11 PM–1 AM) — with a smaller peak after waking up.
The “doggy style” position — where one partner bends over, gets on all fours, or leans forward for penetration — is classified as a rear‑entry sex position in human sexuality research
An erection is a vascular process where the corpora cavernosa fill with blood, increasing in length and thickness, often initiated by the parasympathetic nervous system.
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)
