It is very sexy, without being too explicit.
The fact that Edward Woodward's character is a virgin is just so erotic. It's his finest performance ever.
The first time I saw that scene (many years ago now), with Willow trying to entice the virgin policeman into her room, I almost died - it was so amazingly sexy! And that haunting music is so apt.
I don't often get this with many films - but I really wish I was about to watch it for the very first time. I envy anyone who hasn't yet seen it.