A girl/woman who for religious or other reasons decides that she will only have anal sex because it 'doesn't count' as actual sex. This contradicts the more common belief that anal sex is actually a step further than regular sex. This leads intelligent people around her to scratch their heads and say, "What the fuck?!"

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.