Post-coital dysphoria is a condition marked by feelings of agitation, melancholy, anxiety or sadness after intercourse that can last between five minutes and two hours.

When he was in his early 20s, Los Angeles-based writer Brandon G. Alexander often felt an inexplicable sadness after sex, even when it was “good” sex with people he liked.

“The best way to describe the feeling is empty or sometimes shame, depending on my relationship and intention with the person,” the 30-year-old founder of the men’s lifestyle site New Age Gents told HuffPost.

“Our culture teaches men how to be physically connected to someone, but we ignore the truth that sex is highly emotional and spiritual. The idea that a man wouldn’t feel something before, during or after sex is unrealistic, but most have become so conditioned to think otherwise.”

What Alexander experienced years ago is what researchers call “post-coital dysphoria.” PCD, as they refer to it, is a condition marked by feelings of agitation, melancholy, anxiety or sadness after intercourse, even when it’s good, consensual sex. The condition can last between five minutes and two hours.

It’s also called “post-coital tristesse,” which literally means “sadness” in French. In the 17th century, philosopher Baruch Spinoza summed it up this way: Once the “enjoyment of sensual pleasure is past, the greatest sadness follows.”

Many studies have examined the first three phases of the human sexual response cycle (excitement, plateau, orgasm), but the resolution phase has often been overlooked.

That’s starting to change, though. In a 2015 study in the Journal of Sexual Medicine, almost half of the women surveyed reported experiencing PCD at some point in........

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