A commercial space I was looking at required 2 nursing/wellness rooms because of the size. For a team of 10 dudes.

The premise of these rules is that they apply regardless of gender, in order to avoid incentivizing an all-male office specifically to avoid regulations. Now, if you do decide your company doesn't need to be a pure sausage fest, you won't be on the hook to build out a new room specifically to accommodate someone of the opposite gender.

And, in the meantime, you've got a space to take a private phone call or pop an advil and close your eyes for a minute, if you feel the need.