most people want to socialize with the opposite sex, and are unhappy (and hence unproductive) if they can’t;
the conscious reasons for wanting to socialize with the opposite sex often have nothing to do with “fluid exchange” (to use the John Nash character’s phrase from A Beautiful Mind),
let he (or she) who is without subconscious Darwinian motivations cast the first stone,
human beings didn’t evolve to live their lives in an 85%-male environment,
by the Pigeonhole Principle, not every straight male will be as lucky as I was to find a girlfriend in the remaining 15%, and
computer science departments could attract and retain better people of both sexes if they felt less like monasteries or pirate ships.
Related:
-- Scott Aaronson
I could cite numerous examples suggesting otherwise, NASA during the Mercury/Gemini/Apollo era being the most famous.
Details?
Well mission control and the astronaut core were all male. Didn’t seem to interfere with their ability to attract and retain top talent.
Never saw a CS department that looked like a monastery. As to pirate ships, well… :-D