As for the burying up to the chest & waist bit there are reasons for this. Its deffo different but not unfair.. Yes a man can marry up to four wives provided he treats them all equally which trust me is very very hard for which reasons many men choose to be with just one wife for the fear of falling in to great sin by not treating them alike.
There are many points in the sharia where it may appear like the males are getting a raw deal compared to women & vice versa but the fact is we as Muslims accept the laws of our Lord for we believe He wishes only good for us by them all & He is most Just & most Wise...