Fear not, it's not from a weak penis game, but rather just the body's natural chemicals reacting badly. Researchers from the Queensland Institute of Technology theorize the sadness to source from "hormonal shifts which occur after orgasm, which can also trigger post-coital headaches."
The conclusion from the survey says what many, many women are probably thinking when serious depression follows a sexual encounter: this is a problem that's under-recognized and under-researched. Just remember, guys: it's not your fault.
Except for you, Wil, your peep's on the fritz.
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Jeremy Glass is a writer for Thrillist and considers himself lucky, because he never feels this way after sex...just before and during.