Allow for a man's initiation before sex (6)
I believe the answer is:
permit
'allow' is the definition.
('permit' can be a synonym of 'allow')
'a man's initiation before sex' is the wordplay.
'a' becomes 'per'.
'initiation' says to take the initial letters.
'before' is a charade indicator (letters next to each other).
'sex' becomes 'it' (a common euphemism).
The first letter of 'man' is 'm'.
'per'+'m'+'it'='PERMIT'
'for' is the link.
(Other definitions for permit that I've seen before include "Officially allow" , "Licence -- license" , "Allow, authorise" , "Warrant" , "Official document giving authorisation" .)