Meeting for sex (8)
I believe the answer is:
congress
This clue is a double definition.
'meeting' is the first definition.
(congress is a kind of meeting)
'sex' is the second definition.
(congress is a kind of sex)
'for' is the link.
(Other definitions for congress that I've seen before include "old-style commerce" , "US Federal legislature" , "Meeting of delegates" , "Formal meeting" , "Politicians" .)