Consent for each male before sex (6)
I believe the answer is:
permit
'consent' is the definition.
(thesaurus)
'each male before sex' is the wordplay.
'each' becomes 'per'.
'male' becomes 'm' (common abbreviation).
'before' says to put letters next to each other.
'sex' becomes 'it' (a common euphemism).
'per'+'m'+'it'='PERMIT'
'for' acts as a link.
(Other definitions for permit that I've seen before include "Officially allow" , "Warrant" , "Let - pass" , "Allow, sanction" , "Allow - visa" .)