Sultry MILF Raven Hart has released a hot 2018 calendar and to celebrate the new year is offering fans a chance to win a free, autographed one by AVN Fan Voting for her as “Hottest MILF.” The calendar contest is free and easy: Fans go to https://avn.com/awards/voting/hottest-milf and vote, then send a screen shot of the vote to [email protected].…