Am I required to tell my employer my personal email address or my marital status?

Question Details:

Every year we are sent an email to update our personal email. Address/Emergency contact/Phone. All of a sudden they are asking for our home phone, mobile phone, personal email, and our marital status. This is making me curious about why they need my personal email address and what is the point of knowing my marital status? It has no bearing on my job that Ihave worked at for what seems like 100 years. Just seems very suspicious to me, like they are going to start doing searches on my email on the web or something. I just want to know if this is something they can legally ask? Do I have to give this info? 

IMPORTANT NOTICE: The Answer(s) provided above are for general information only. The attorney providing the answer was not serving as the attorney for the person submitting the question or in any attorney-client relationship with such person. Laws may vary from state to state, and sometimes change. Tiny variations in the facts, or a fact not set forth in a question, often can change a legal outcome or an attorney's conclusion. Although has verified the attorney was admitted to practice law in at least one jurisdiction, he or she may not be authorized to practice law in the jurisdiction referred to in the question, nor is he or she necessarily experienced in the area of the law involved. Unlike the information in the Answer(s) above, upon which you should NOT rely, for personal advice you can rely upon we suggest you go to and retain an attorney to represent you.