Update table with two where clauses

I want to update table using two where clauses.
Update table set sex = 'M' where sex = 'F' and sex = 'F' where sex = 'M'
It gives error "syntax error near where clause"

I want to update sex value in one update statement.
dotnet0824Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
this will work better:
Update table set sex =case when sex ='F' then 'M' when sex = 'M' then 'F' end
where sex in ( 'F' ,  'M' )
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HuyBDCommented:
Update table set sex =case when sex ='F' then 'M' when sex = 'M' then 'F' end from table
HuyBD;
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HuyBDCommented:
sorry, I have a missing

Update table set sex =case when sex ='F' then 'M' when sex = 'M' then 'F' else sex end

HuyBD;
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dotnet0824Author Commented:
Thanks a lot for the immediate replies.
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