He basically admits it...
just in a weasley way.
"I clearly misread the situation during a sex scene on set and have apologized to Sarah,” the statement read.
To call that misreading the situation is generous. Of course she seemed interested in him during a sex scene where her character was supposed to be interested in his character. It should take a whole lot more than good acting to get any sensible man to assume he could take that step off screen based on behavior on screen. Actually, looking at his off-screen approach, his actions would never be appropriate.