Earlier quoted context omitted.
experts exchange? expertSEXchange dot com edit: wow. Just showing the people who didn't get the reference.
The second variant is correct, indeed, as the sex of experts shifts (changes) from the male domain to more and more female experts.
Judging from the downvotes, it's interesting to see that most people don't seem to know the second meaning of "sex" as a simple synonym to "gender", thus falsely assuming my above comment to be offensive.