Hi Lauren - I believe the standard contact field for pronouns is on the Attendee Profile in Attendee Hub (Features > Attendee Profile). You can allow attendees to edit this section:

For many years we had a custom field for pronouns as well. When the standard contact field was added, I had our developers populate that field with pronoun information instead of the custom field (contacts are added via an API). Then I did a contact import to move all pronoun data into the standard contact field so I could delete the custom field (was also working on removing unneeded custom fields).
I can see in your use case if you have a specific set choices your organization uses, the custom field might be a better option. I have found that the standard contact field isn't always available in areas where I might want to drop in a data tag or a report field but so far it that hasn't been a showstopper for me.
------------------------------
Christine D'Arcy
Cvent Application Administrator | Office of Orientation Programs
University of Southern California
------------------------------