Since sex can be a form of physical exercise (and yes, sex burns calories, too), it can also boost the release of nitric oxide, which increases blood flow and oxygen throughout the body, Barr tells mbg. This is what leads to an after-sex glow.
“What helps create that after-sex glow is that nearly every cell in the skin can make nitric oxide, which is key for maintaining blood flow,” Barr says. “But it also helps bolster the skin’s barrier function, boosts its microbial defenses, promotes wound healing, and buffers the harmful effects of environmental exposures like UV radiation.”
With naturally flushed cheeks and a little tinge of dewy sweat, who needs makeup?