Ginny Fuchs -- a U.S. Olympic boxer -- is in the clear ... she won't face punishment for a positive drug test after officials say she accidentally ingested banned substances through sex.
The story is wild ... Fuchs learned of the positive doping test back in March -- but USADA launched an investigation after she claimed it was all because she was bangin' her BF without protection.
The probe into the incident revealed the 32-year-old wasn't lying ... USADA officials say her positive sample did, in fact, come through intercourse.
"USADA determined that Fuchs’ male partner was using therapeutic doses of letrozole and GW1516 and the low amounts of letrozole metabolite," the org.