look up any word, like wcw:
 
3.
Deep intellectual intercourse between people.
We talked about Tolstoy for hours last night. It was total brain sex!
by The Manwhore April 27, 2011
 
1.
the physical action of putting two (or more) foreheads together to stimulate brain interaction, usually seen at certain high schools with certain debaters ;P
Hammer: Debaters have a weird relationship. They need to date people who are mentally stimulating.
Rose: Oh! Like brain sex!
Mark: What's brain sex? Like this?... *has brain sex with Rose*

Rose: hey mark...
Mark: hey rose....
Rose: you wanna have brain sex?
Mark: o...k...
Rose and Mark: *put foreheads together* AAAAAHHHHH! OH YEAH!

Webb: ......o.O.......
by The Master Debater March 29, 2009
 
2.
Sex= intercourse. Intercourse= Dealings or communications between persons or groups. Sex brings a rush in which both the physical body and the mental capacities are focused on one aim, one goal, and that goal is to reach a physical awareness in which pleasure is wholly present. Reading/Writing/Talking is similar. Instead of exching fluids ideas are exchanged, creating a "mental orgasm"
Once the apex of intellectual satisfaction is reached,
an emotional, mental AND phsycial condition(depending on the person) in which the brain is engaged rather than the phsycial being. Also, there is the Intellectual Orgasm, and the Physical Orgasm, and then the Epiphany Orgasm, which is both of those at the same time.
"Hey, did you see me and talking last night....we totally had brain sex"

"ahhhhh...yeah...we were up late last night having brain sex, i just got this awesome book from the PaperBack Shack"
by AnatheVaginaWarrior July 23, 2006
 
4.
Sex= intercourse. Intercourse=
Dealings or communications between persons or groups. Sex= brings a rush in which both the physical body and the mental capacities are focused on one aim, one goal, and that goal is to reach a physical awareness in which pleasure is wholly present. Reading/Writing/Talking is similar. Instead of exching fluids
ideas are exchanged, creating a "mental orgasm" . once the apex of intellectual satisfaction is reached, in a sense, that is sort of what i call "brain sex" in which the brain is engaged rather than the phsycial being.
OH and also there is the Intellectual Orgasm, and the Physical Orgasm, and then the Epiphany Orgasm, which is both of those at the same time. Reading is sexy!
"Omg, i just had the most amazing conversation...total brain sex right there."
by AnatheVaginaWarrior July 23, 2006