What how often.
( What ( how ( often . ) ) )
(ROOT (FRAG (SBAR (WHNP (WP What)) (FRAG (SBARQ (WHNP (WRB how)) (ADVP (RB often) (. .)))))))
How often did you have sex with him.
( ( How often ) ( ( ( did you ) ( have ( sex ( with him ) ) ) ) . ) )
(ROOT (SBARQ (WHADVP (WRB How) (RB often)) (SQ (VBD did) (NP (PRP you)) (VP (VB have) (NP (NP (NN sex)) (PP (IN with) (NP (PRP him)))))) (. .)))