This couple did.

http://www.dailymail.co.uk/femail/article-1269063/Could-make-love-day-month-This-couple-tried--did-marriage.html

The wife gave her husband a gift for the 12th anniversary of their first date. "His gift was, in fact, to make love with me every day for the following month"

Personally I think it would lose its spontaneity and would become a chore to HAVE to do every day for a month. You?