Assuming you're working in big tech, plenty of your coworkers are already having affairs. Those tech conferences, offsites, etc. are filled with married people hooking up.

1. I don't think this is exclusive to big tech

2. I don't think "plenty" means majority, especially when it comes to married people, sure plenty of single coworkers or whatever other relationship are having affairs more likely than the married ones, but yes, if married person has affair it's most likely to have it with coworker for obvious reasons (seems studies say roughly 1/3 of all affairs are with coworker)

It is famously male dominated place. An offsite may have some gay action going on, but most are not into that.