You can also ask the hotel for a credit card authorization form so they can put all charges under your charge card. Often the reservation is in my name and my wife checks in without me- I have had no problems with her getting into the room and Marriott points to my account as long as I call the hotel in advance.
Some hotels will automatically bill to my credit card on file. Other hotels need to see an actual credit card and will only bill to the card they run through at check in. Just had this happen 2 weeks ago- my wife didn't have her Marriott Card and they wouldn't let her charge the room to my card on file.