The origins of the word
Sapiosexual is a recently constructed word (neologism) that has come into common usage, particularly on social networking sites where people are self-identifying as sapiosexual. It is a concatenation of the latin root sapio- from sapiens meaning wise or intelligent (itself derived from sapere which means to taste, or rather, to discern) and the latin root -sexualis as it pertains to sexual preferences.
There are a few definitions to be found online, all with slight variations. Wikipedia currently redirects queries for sapiosexual to pansexual.
Other derivatives of sapiosexual found online are sapiosexuality and sapiosexy.
Wolfieboy of LiveJournal (Darren Stalder) claims to have invented the word in 1998.
Sapiosexual in current usage:
Fun & Intersting Quotes
"I am sapiosexual. I think geeks and nerds are sexy--I often want to rub my clit against their minds." -Kayar Silkenvoice
"Me? I don't care too much about the plumbing. I want an incisive, inquisitive, insightful, irreverent mind. I want someone for whom philosophical discussion is foreplay. I want someone who sometimes makes me go ouch due to their wit and evil sense of humor. I want someone that I can reach out and touch randomly. I want someone I can cuddle with. I decided all that means that I am sapiosexual." - Wolfieboy
"I am a sapiosexual. I admit to being attracted to a cute face, or a sexy body, or a winning smile. But those things simply catch my eye. For someone to keep my attention requires the ability to uphold their side of a conversation." --luvnkisses
"Sapiosexuality is the idea that sapience is the single-most important determining factor in one’s sexual preferences. So one is first most attracted to someone who appears to be thoughtful, rational and grounded." --Iain
"Owing to my timidity, I did not get that good a look, but her T-shirt at least had a ?, an F with an arrow and '07 marking the year, so she had presumably participated in some physics contest. Sadly, few sapiosexy girls (this is not (hetero)sexist; it's just egocentric) flaunt their stuff at strangers like that." --brtkrbzhnv
"Sapiosexuals: I ejaculate on the mere thought of a girl reading Kant's ontological argument explanation out loud." --Mokami
"And just what is "sapiosexual?" Only has sex with wise persons? Only has sex with humans? ...with the self-aware?" --Jeffrey Miller
"braiiiiiiiiins!... sapiosexuals remind me of zombies" -- Effervescence