story
Interesting article here covering sex (not gender) gap: http://www.techrepublic.com/blog/programming-and-development...
...and then there's the actual BLS stats here (ftp://ftp.bls.gov/pub/special.requests/lf/aat11.txt) which suggest something like 20% females in the workforce.
In the game industry, at least as of the IGDA survey in '05, we see something like 92% identify as straight (http://archives.igda.org/diversity/IGDA_DeveloperDemographic...).
So, we could back-of-the-envelope that perhaps a figure of 75% is reasonable, and 85% is not absurd as a guesstimate if you don't fact check.