Upon request, clients are able to have their online album password protected. This prevents the public and others not involved with your event from seeing any of the photos tied to your event. Anything mature in nature, which happens on occasion, is required to be password protected.
The only con is how you’ll need to send the password to all of your guests. Either that, or send your event photos out individually yourself. Although this probably won’t happen, if your password becomes leaked by one of your guests, it could then be opened to the public. In the extreme unlikelihood something like that happened, Elisio and Laura Huerta will create a different password for you.