As part of the vetting procedure, my government job (not dealing with highly classified material) asked my former employers if they knew any of my sexual fetishes.
People often talk. Jim used to date Jenny in Accounting, and he said she's really, like REALLY, into S/M, etc.
Plus you'd be surprised (or maybe not) as to the number of DNS queries we get from employee workstations that are to questionable websites. I couldn't tell you all of my coworkers that are gay, but I can tell you a few that are hitting gay porn websites from their work laptop.