Xenophile -- A person who fucks aliens. We're not talking greasy Mexicans here, but honest-to-goodness aliens. Non-Terrestrial Intelligences, little green men, Martians and all that rot -- Kinky to the max.

XXX -- Meaning the contained material is sexually explicit (like a picture showing my cock slipping into a tight, blond pussy). As far as we're concerned, the more X's, the better.

Xylophoning -- The act of a woman suckling yer nutz, causing extreme pleasure in the male.